Synonyms for Latch:

n.

close off, close up, jam something open/shut, block off, lock out. dead bolt, keyhole, combination lock, deadlock. fastener (noun)
clinch, band, knitting, clamp, zipper, bonding, middleman, twine, weld, lock, stitch, vise, hook, bolt, buckle, coupling, connector, catch, lace, binding, spike, mediator, button, tie, grapnel, chain, hasp, cinch, staple, strap, splice, mucilage, Vinculum, go-between, paste, nail, stay, belt, fastener, rivet, seal, rabbet, braid, skewer, bracket, cotter, medium, pin, clip, brad, knot, ligament, guy, cincture, fuse, hitch, link, closure, hawser, clasp, tack, cleat, suture, cement, binder, brace, bond, glue, string, snap, thread, agent, fastening, anchor, hinge.
latch (noun)
door latch.
lock (noun)
catch, bolt, fastening, hook, hasp, clamp.

v.

close (verb)
close, shut, fasten, jam, secure, block, join, barricade, stop.
fasten with lock (verb)
close, close up, secure, cinch, lock.

Other synonyms:

keyhole, combination lock, dead bolt. deadlock. Other relevant words:
deadlock, door latch, lock out, close up, keyhole.

Usage examples for latch

  1. She moved away, latch key in hand. – Winding Paths by Gertrude Page
  2. This time the latch did not click as she cautiously closed the gate behind her. – Mrs. Skaggs's Husbands and Other Stories by Bret Harte
  3. They raised the latch of the door very softly, and looked out and listened. – The Freedmen's Book by Lydia Maria Child