composition vs compost

composition and compost both are nouns.

Word	Noun	Adjective	Verb	Adverb
composition	Yes	No	No	No
compost	Yes	No	Yes	No

As nouns, compost is a hyponym of composition; that is, compost is a word with a more specific, narrower meaning than composition:

Other hyponyms of composition include paste, ambrosia, beebread, soup.

composition (noun)	compost (noun)
the act of creating written works	a mixture of decaying vegetation and manure; used as a fertilizer
musical creation
something that is created by arranging several things to form a unified whole
the way in which someone or something is composed
the spatial property resulting from the arrangement of parts in relation to each other and to the whole
an essay (especially one written as an assignment)
a musical work that has been created
art and technique of printing with movable type
a mixture of ingredients

composition (verb)	compost (verb)
	convert to compost