In context|us|lang=en terms the difference between pin and stickpin
is that
pin is (us) a simple accessory that can be attached to clothing with a pin or fastener, often round and bearing a design, logo or message, and used for decoration, identification or to show political affiliation, etc while
stickpin is (us) an ornamented pin used to secure a necktie's end flat against the shirt, a tie tack.
As nouns the difference between pin and stickpin
is that
pin is a small device, made (usually) of drawn-out steel wire with one end sharpened and the other flattened or rounded into a head, used for fastening while
stickpin is (us) an ornamented pin used to secure a necktie's end flat against the shirt, a tie tack.
As a verb pin
is (
often followed by a preposition such as'' to''' ''or'' ' on ) to fasten or attach (something) with a pin.