wave guide vs waveguide

wave guide and waveguide both are nouns.

Word	Noun	Adjective	Verb	Adverb
wave guide	Yes	No	No	No
waveguide	Yes	No	No	No

As nouns, wave guide and waveguide are synonyms defined as:

wave guide and waveguide: a hollow metal conductor that provides a path to guide microwaves; used in radar

wave guide (noun)	waveguide (noun)
a hollow metal conductor that provides a path to guide microwaves; used in radar	a hollow metal conductor that provides a path to guide microwaves; used in radar