beetling vs beetle

beetling is not a noun while beetle is a noun.

Word	Noun	Adjective	Verb	Adverb
beetling	No	Yes	No	No
beetle	Yes	Yes	Yes	No

As adjectives, beetling and beetle are synonyms defined as:

beetling (noun)	beetle (noun)
	insect having biting mouthparts and front wings modified to form horny covers overlying the membranous rear wings
	a tool resembling a hammer but with a large head (usually wooden); used to drive wedges or ram down paving stones or for crushing or beating or flattening or smoothing

beetling (adjective)	beetle (adjective)
jutting or overhanging	jutting or overhanging

beetling (verb)	beetle (verb)
	beat with a beetle
	fly or go in a manner resembling a beetle
	be suspended over or hang over