composition vs grain

composition and grain both are nouns.

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

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

composition: the way in which someone or something is composed
grain: the physical composition of something (especially with respect to the size and shape of the small constituents of a substance)

Other hyponyms of composition include structure, phenotype, genetic constitution, genotype, texture, karyotype.

composition (noun)	grain (noun)
the act of creating written works	the direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric
musical creation	the physical composition of something (especially with respect to the size and shape of the small constituents of a substance)
something that is created by arranging several things to form a unified whole	the smallest possible unit of anything
the way in which someone or something is composed	foodstuff prepared from the starchy grains of cereal grasses
the spatial property resulting from the arrangement of parts in relation to each other and to the whole	a relatively small granular particle of a substance
an essay (especially one written as an assignment)	dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn
a musical work that has been created	a cereal grass
art and technique of printing with movable type	1/7000 pound; equals a troy grain or 64.799 milligrams
a mixture of ingredients	1/60 dram; equals an avoirdupois grain or 64.799 milligrams
	a weight unit used for pearls or diamonds: 50 mg or 1/4 carat
	the side of leather from which the hair has been removed

composition (verb)	grain (verb)
	form into grains
	become granular
	thoroughly work in
	paint (a surface) to make it look like stone or wood