cleave vs agglutinate

cleave is not an adjective while agglutinate is an adjective.

Word	Noun	Adjective	Verb	Adverb
cleave	No	No	Yes	No
agglutinate	No	Yes	Yes	No

As verbs, agglutinate is a hyponym of cleave; that is, agglutinate is a word with a more specific, narrower meaning than cleave:

cleave: come or be in close contact with; stick or hold together and resist separation
agglutinate: clump together; as of bacteria, red blood cells, etc.

Other hyponyms of cleave include mold, mould, conglutinate.

cleave (adjective)	agglutinate (adjective)
	united as if by glue

cleave (verb)	agglutinate (verb)
separate or cut with a tool, such as a sharp instrument	clump together; as of bacteria, red blood cells, etc.
make by cutting into	string together (morphemes in an agglutinating language)
come or be in close contact with; stick or hold together and resist separation