songster vs songwriter

songster and songwriter both are nouns.

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

As nouns, songster and songwriter are synonyms defined as:

Other synonyms of songster include ballad maker.

songster (noun)	songwriter (noun)
any bird having a musical call	a composer of words or music for popular songs
a person who sings with skill
a composer of words or music for popular songs