submersible groundwater pump vs groundwater pump

submersible groundwater pump and groundwater pump both are nouns.

Word	Noun	Adjective	Verb	Adverb
submersible groundwater pump	Yes	No	No	No
groundwater pump	Yes	No	No	No

As nouns, submersible groundwater pump and groundwater pump are synonyms defined as:

submersible groundwater pump and groundwater pump: A pump suited for sampling and pumping underground water supplies.

submersible groundwater pump (noun)	groundwater pump (noun)
A pump suited for sampling and pumping underground water supplies.	A pump suited for sampling and pumping underground water supplies.