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