hollow vs meaningless

hollow is a noun but meaningless is not a noun.

Word	Noun	Adjective	Verb	Adverb
hollow	Yes	Yes	Yes	No
meaningless	No	Yes	No	No

hollow (noun)	meaningless (noun)
a depression hollowed out of solid matter
a small valley between mountains
a cavity or space in something

hollow (adjective)	meaningless (adjective)
not solid; having a space or gap or cavity	having no meaning or direction or purpose
lacking in substance or character	producing no result or effect
devoid of significance or force
as if echoing in a hollow space

hollow (verb)	meaningless (verb)
remove the interior of
remove the inner part or the core of