From Oxford
los·er
[ˈlo͞ozər]
noun
a person or thing that loses or has lost something, especially a game or contest:
"he was the loser in the race"
Similar:
also-ran
runner-up
defeated person
the defeated
the vanquished
a person who accepts defeat with good or bad grace, as specified:
"we won fair and square—they should concede that and be good losers"
a person or thing that is put at a disadvantage by a particular situation or course of action:
"children are the losers when politicians keep fiddling around with education"
informal
derogatory
a person who fails frequently or is generally unsuccessful in life:
"a ragtag community of rejects and losers"