Lexis meaning ‘word, phrase’ (hence lexicos ‘having to do with words’) and logos

Ex. the morpheme well and half on the one hand occur as free morphemes that coincide with the stem and the word-form in utterances like sleep well, half an hour,” on the other hand they occur as bound morphemes in words like well-known, half-eaten, half-done.
Two groups of morphemes should be specially mentioned.
1. morphemes of Greek and Latin origin often called combining forms
Ex. telephone, telegraph, phonoscope, microscope
The morphemes tele-, graph-, scope-, micro-, phone- are characterised by a definite lexical meaning and peculiar stylistic reference: tele- means ‘far’, graph- means ‘writing’, scope — ’seeing’, micro- implies smallness, phone- means ’sound.’ Comparing words with tele- as their first constituent, such as telegraph, telephone, telegram one may conclude that tele- is a prefix and graph-, phone-, gram-are root-morphemes. On the other hand, words like phonograph, seismograph, autograph may create the impression that the second morpheme graph is a suffix and the first — a root-morpheme.
? they are composed of a suffix and a prefix
Solution: these morphemes are all bound root-morphemes of a special kind and such words belong to words made up of bound roots (do not possess the part-of-speech meaning typical of affixational morphemes).
2. morphemes occupying a kind of intermediate position, morphemes that are changing their class membership.
Ex. The root-morpheme man- found in numerous words like postman ['poustmэn], fisherman [fi∫эmэn], gentleman ['d3entlmэn] in comparison with the same root used in the words man-made ['mænmeid] and man-servant ['mæn,sэ:vэnt] is pronounced, differently, the [æ] of the root-morpheme becomes [э] and sometimes disappears altogether.
Some linguists: man=er (denoting an agent rather than a male adult).
We can hardly regard [man] as having completely lost the status of a root-morpheme. Besides it is impossible to say she is an Englishman (or a gentleman) and the lexical opposition of man and woman is still felt in most of these compounds (cf. though Madam Chairman in cases when a woman chairs a sitting and even all women are tradesmen). It follows from all this that the morpheme -man as the last component may be qualified as semi-free.
holic – semi-suffix (alcoholic, chocoholic, speedoholic)
gate=scandal (Irangate, Camillagate)

In most cases the morphemic structure of words is transparent enough and individual morphemes clearly stand out within the word. The segmentation of words is generally carried out according to the method of Immediate and Ultimate Constituents. This method is based on the binary principle, i.e. each stage of the procedure involves two components the word immediately breaks into. At each stage these two components are referred to as the Immediate Constituents. Each Immediate Constituent at the next stage of analysis is in turn broken into smaller meaningful elements. The analysis is completed when we arrive at constituents incapable of further division, i.e. morphemes. These are referred to Ultimate Constituents.

Morphemic analysis under the method of Ultimate Constituents may be carried out on the basis of two principles: the so-called root-principle and affix principle.
According to the affix principle the splitting of the word into its constituent morphemes is based on the identification of the affix within a set of words, e.g. the identification of the suffix -er leads to the segmentation of words singer, teacher, swimmer into the derivational morpheme - er and the roots teach- , sing-, drive-.
According to the root-principle, the segmentation of the word is based on the identification of the root-morpheme in a word-cluster, for example the identification of the root-morpheme agree- in the words agreeable, agreement, disagree.
4) . The main aim, principles and methods of derivational analysis.

The analysis of the morphemic composition of words defines the ultimate meaningful constituents (UCs), their typical sequence and arrangement, but it does not reveal the hierarchy of morphemes making up the word, neither does it reveal the way a word is constructed, nor how a new word of similar structure should be understood.