flask vs containerful

flask and containerful both are nouns.

Word	Noun	Adjective	Verb	Adverb
flask	Yes	No	No	No
containerful	Yes	No	No	No

As nouns, containerful is a hypernym of flask; that is, containerful is a word with a broader meaning than flask:

flask (noun)	containerful (noun)
bottle that has a narrow neck	the quantity that a container will hold
the quantity a flask will hold