gutter vs cullis

gutter and cullis both are nouns.

Word	Noun	Adjective	Verb	Adverb
gutter	Yes	No	Yes	No
cullis	Yes	No	No	No

As nouns, cullis is a hyponym of gutter; that is, cullis is a word with a more specific, narrower meaning than gutter:

gutter: a channel along the eaves or on the roof; collects and carries away rainwater
cullis: a gutter in a roof

Other hyponyms of gutter include chute, slide, slideway, sloping trough.

gutter (noun)	cullis (noun)
a channel along the eaves or on the roof; collects and carries away rainwater	a gutter in a roof
a tool for gutting fish
a worker who guts things (fish or buildings or cars etc.)
misfortune resulting in lost effort or money

gutter (verb)	cullis (verb)
provide with gutters
wear or cut gutters into
flow in small streams
burn unsteadily, feebly, or low; flicker