Derivational suffixes can be divided into two categories: class-changing derivation and class-maintaining derivation. In English, they include •
-ly (usually changes adjectives into adverbs, but also some nouns into adjectives) •
-al /
-ual (usually changes nouns into adjectives) •
-ic /
-ical (usually changes nouns into adjectives) •
-ish (usually changes nouns into adjectives/class-maintaining, with the word class remaining an adjective) •
-ful (usually changes nouns into adjectives) •
-oid (usually changes nouns into adjectives) •
-like (usually changes nouns into adjectives) •
-less (usually changes nouns into adjectives) •
-able/
-ible (usually changes verbs into adjectives) •
-ant (usually changes verbs into nouns, often referring to a human agent) •
-tion/
-ion/
-ation (usually changes verbs into nouns) •
-ment (usually changes verbs into nouns) •
-ity (usually changes adjectives into nouns) •
-ness (usually changes adjectives into nouns) •
-fy (usually changes nouns into verbs) •
-ise/
-ize (usually changes nouns into verbs) •
-ess (usually class-maintaining, with the word class remaining a noun) •
-ism (usually class-maintaining, with the word class remaining a noun) •
-ist (usually class-maintaining, with the word class remaining a noun) •
-hood (usually class-maintaining, with the word class remaining a noun) •
-logy/
-ology (usually class-maintaining, with the word class remaining a noun) •
-um (usually) museum; stadium; auditorium; aquarium; planetarium; medium •
-wise From wīse ("manner, way, condition, direction") == Altered pronunciation in English ==