placement vs composing

placement and composing both are nouns.

Word	Noun	Adjective	Verb	Adverb
placement	Yes	No	No	No
composing	Yes	No	No	No

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

placement: the spatial property of the way in which something is placed
composing: the spatial property resulting from the arrangement of parts in relation to each other and to the whole

placement (noun)	composing (noun)
the act of putting something in a certain place	musical creation
contact established between applicants and prospective employees	the spatial property resulting from the arrangement of parts in relation to each other and to the whole
the spatial property of the way in which something is placed