overlook vs overshadow

overlook is a noun but overshadow is not a noun.

Word	Noun	Adjective	Verb	Adverb
overlook	Yes	No	Yes	No
overshadow	No	No	Yes	No

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

Other hyponyms of overlook include dwarf, shadow.

overlook (noun)	overshadow (noun)
a high place affording a good view

overlook (verb)	overshadow (verb)
leave undone or leave out	cast a shadow upon
watch over	be greater in significance than
look past, fail to notice	make appear small by comparison
look down on
be oriented in a certain direction