seabag vs drawstring bag

seabag and drawstring bag both are nouns.

Word	Noun	Adjective	Verb	Adverb
seabag	Yes	No	No	No
drawstring bag	Yes	No	No	No

As nouns, drawstring bag is a hypernym of seabag; that is, drawstring bag is a word with a broader meaning than seabag:

seabag: a cylindrical drawstring bag used by sailors to hold their clothing and other gear
drawstring bag: a bag that is closed at the top with a drawstring

seabag (noun)	drawstring bag (noun)
a cylindrical drawstring bag used by sailors to hold their clothing and other gear	a bag that is closed at the top with a drawstring