subaquatic vs subaqueous

subaquatic and subaqueous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
subaquatic	No	Yes	No	No
subaqueous	No	Yes	No	No

As adjectives, subaquatic and subaqueous are synonyms defined as:

Other synonyms of subaquatic include submerged, submersed, underwater.

subaquatic (adjective)	subaqueous (adjective)
partially aquatic; living or growing partly on land and partly in water	growing or remaining under water
growing or remaining under water