theme - noun

the subject matter of a conversation or discussion

a unifying idea that is a recurrent element in literary or artistic work

(music) melodic subject of a musical composition

an essay (especially one written as an assignment)

(linguistics) the form of a word after all affixes are removed

theme - verb

• provide with a particular theme or motive

theme - thesaurus

base   composition   idea   motif   paper   radical   report   root   stem   subject   topic