molasses vs sirup

molasses and sirup both are nouns.

Word	Noun	Adjective	Verb	Adverb
molasses	Yes	No	No	No
sirup	Yes	No	No	No

As nouns, sirup is a hypernym of molasses; that is, sirup is a word with a broader meaning than molasses:

molasses: thick dark syrup produced by boiling down juice from sugar cane; especially during sugar refining
sirup: a thick sweet sticky liquid

Other hypernyms of molasses include syrup.

molasses (noun)	sirup (noun)
thick dark syrup produced by boiling down juice from sugar cane; especially during sugar refining	a thick sweet sticky liquid