dwarf vs overtop

dwarf is a noun but overtop is not a noun.

Word	Noun	Adjective	Verb	Adverb
dwarf	Yes	No	Yes	No
overtop	No	No	Yes	No

As verbs, overtop is a hypernym of dwarf; that is, overtop is a word with a broader meaning than dwarf:

Other hypernyms of dwarf include command, dominate, overlook.

dwarf (noun)	overtop (noun)
a plant or animal that is atypically small
a person who is markedly small
a legendary creature resembling a tiny old man; lives in the depths of the earth and guards buried treasure

dwarf (verb)	overtop (verb)
check the growth of	look down on
make appear small by comparison