songster vs composer

songster and composer both are nouns.

Word	Noun	Adjective	Verb	Adverb
songster	Yes	No	No	No
composer	Yes	No	No	No

As nouns, composer is a hypernym of songster; that is, composer is a word with a broader meaning than songster:

songster (noun)	composer (noun)
any bird having a musical call	someone who composes music, usually as a profession
a person who sings with skill
a composer of words or music for popular songs