realisation vs composition

realisation and composition both are nouns.

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

As nouns, composition is a hypernym of realisation; that is, composition is a word with a broader meaning than realisation:

realisation: the completion or enrichment of a piece of music left sparsely notated by a composer
composition: musical creation

Other hypernyms of realisation include composing.

As nouns, composition is a hypernym of realisation; that is, composition is a word with a broader meaning than realisation:

realisation: a musical composition that has been completed or enriched by someone other than the composer
composition: a musical work that has been created

Other hypernyms of realisation include musical composition, opus, piece, piece of music.

realisation (noun)	composition (noun)
making real or giving the appearance of reality	the act of creating written works
a sale in order to obtain money (as a sale of stock or a sale of the estate of a bankrupt person) or the money so obtained	musical creation
something that is made real or concrete	something that is created by arranging several things to form a unified whole
the completion or enrichment of a piece of music left sparsely notated by a composer	the way in which someone or something is composed
coming to understand something clearly and distinctly	the spatial property resulting from the arrangement of parts in relation to each other and to the whole
a musical composition that has been completed or enriched by someone other than the composer	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