hanger vs coat hanger

hanger and coat hanger both are nouns.

Word	Noun	Adjective	Verb	Adverb
hanger	Yes	No	No	No
coat hanger	Yes	No	No	No

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

hanger: anything from which something can be hung
coat hanger: a hanger that is shaped like a person's shoulders and used to hang garments on

Other hyponyms of hanger include clothes hanger, dress hanger, strap.

hanger (noun)	coat hanger (noun)
anything from which something can be hung	a hanger that is shaped like a person's shoulders and used to hang garments on
a worker who hangs something