subaquatic vs semiaquatic

subaquatic and semiaquatic both are adjectives.

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

As adjectives, subaquatic and semiaquatic are synonyms defined as:

subaquatic and semiaquatic: partially aquatic; living or growing partly on land and partly in water

subaquatic (adjective)	semiaquatic (adjective)
partially aquatic; living or growing partly on land and partly in water	partially aquatic; living or growing partly on land and partly in water
growing or remaining under water	having an aquatic early or larval form and a terrestrial adult form