The correct spelling is (singular) is inquiry and (plural) inquiries.
NOTE: The British spell it with an en.
That is the correct spelling of the plural noun "laymen" (non-professionals, or non-clergy).
The plural is cantaloupes.
The plural is "emeralds."
The plural is roses.
The plural way to spell studio is studios.
That is the correct spelling of the plural noun "laymen" (non-professionals, or non-clergy).
That is the correct spelling of the plural noun "civilians" (non-military persons).
This is a transposition of the plural noun animals(non-plant living things).
The likely word is the plural noun "juveniles" (non-adults, or teenagers).
The plural is hooves.
The plural is cherries.
The plural is cantaloupes.
The plural is resources.
The plural is roses.
The plural is "emeralds."
The plural way to spell studio is studios.
The plural is bridges.