Beginner level

-er

Meaning: someone who performs an action

Examples: helper, teacher, preacher, dancer
-ion

Meaning: the action or process of

Examples: celebration, opinion, decision, revision
-ity

Meaning: the state or condition of

Examples: probability, equality, abnormality, civility
-ment

Meaning: the action or result of

Examples: movement, retirement, abandonment, establishment
-ness

Meaning: a state or quality

Examples: fondness, awareness, kindness, darkness
-or

Meaning: a person who is something

Examples: distributor, investigator, translator, conductor
-sion

Meaning: state or being

Prefix re-
Meani ng: Again
Examples: Return, rediscover, reiterate, reunite
Prefix semi-
Meaning: Half
Prefix examples: Semicircle, semi-final, semiconscious
Prefix sub-
Meaning: Under
Examples: Submerge, submarine, sub-category, subtitle
Prefix super-
Meaning: Above, over
Examples: Superfood, superstar, supernatural, superimpose
Prefix therm-
Meaning: Heat
Examples: Thermometer, thermostat, thermodynamic
Prefix trans-
Meaning: Across, beyond
Examples: Transport, transnational, transatlantic
Prefix tri-
Meaning: Three
Examples: Triangle, tripod, tricycle
Prefix un-
Meaning: Not
Examples: Unfinished, unfriendly, undone, unknown
Prefix uni-
Meaning: One
Examples: Unicycle, universal, unilateral, unanimous

Examples: depression, confusion, tension, compulsion

-ship

Meaning: position held

Examples: worship, ownership, courtship, internship
-th

Meaning: state or quality

Examples: strength, labyrinth, depth, warmth