- cotter, cottar - a peasant farmer in the Scottish highlands
--1 is a kind of peasant, provincial, bucolic
- cotter, cottier - a medieval English villein
--2 is a kind of serf, helot, villein
- cotter, cottar - fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together
--3 is a kind of fastener, fastening, holdfast, fixing
--3 has particulars: cotter pin