cling vs adjoin

cling is a noun but adjoin is not a noun.

Word	Noun	Adjective	Verb	Adverb
cling	Yes	No	Yes	No
adjoin	No	No	Yes	No

As verbs, adjoin is a hypernym of cling; that is, adjoin is a word with a broader meaning than cling:

cling: come or be in close contact with; stick or hold together and resist separation
adjoin: be in direct physical contact with; make contact

Other hypernyms of cling include contact, meet, touch.

cling (noun)	adjoin (noun)
fruit (especially peach) whose flesh adheres strongly to the pit

cling (verb)	adjoin (verb)
come or be in close contact with; stick or hold together and resist separation	attach or add
hold on tightly or tenaciously	lie adjacent to another or share a boundary
to remain emotionally or intellectually attached	be in direct physical contact with; make contact