How to sign: a round fastener sewn to shirts and coats etc to fit through buttonholes
Categories: fastener, fastening, fixing, holdfast
Within this category: coat button, shirt button
How to sign: lie adjacent to another or share a boundary
"Canada adjoins the U.S."; "England marches with Scotland";
Similiar / Same: adjoin, abut, butt, butt against, edge, border, march
Categories: adjoin, contact, meet, touch
Within this category: neighbor