The crossword solutions for the term USE A KEYHOLE, PERHAPS are PEER (4 letters) and PEERIN (6 letters). The term 'PEER' is a verb meaning to look closely or carefully at something, often with the help of a magnifying glass. The term 'peerin' is an alternate spelling of the verb 'peering', which has the same meaning as 'PEER'. Both terms can be used to describe the act of looking through a keyhole, as one might do to gain a better view of something.