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постучать v stresses
gen.	knock; beat against (of rain); knock for admittance (чтобы войти); pulse; bang; chatter (of one's teeth); clatter; hammer; knock few times; make noise; rap; tap for a while; pelt; tap at something (to tap at [the door/the window/the side window/the windscreen/the rear window] – постучать в [дверь/окно/боковое стекло/лобовое стекло/заднее стекло]; во что-либо TarasZ); tap; throb (of teeth); thump; pound; rattle
Gruzovik	bang (pf of стучать); hammer (pf of стучать); pound (pf of стучать); pulse (pf of стучать); thump (pf of стучать); throb (pf of стучать); of teeth chatter (pf of стучать); tap for a while; knock few times; knock; knock for a while; rap for a while
dentist.	tap the patient's teeth (MichaelBurov)
Makarov.	knock at; rap at; rap on
tech.	tap lightly (молотком)
постучаться v
gen.	give a knock (в дверь); knock (on); tap (В.И.Макаров); rap (on)
Gruzovik	knock on the door several times
Gruzovik, inf.	knock oneself against (pf of стучаться); bang oneself against (pf of стучаться); knock at (pf of стучаться)
inf.	knock oneself (against); bang oneself (against)
Makarov.	knock at; knock at the door; knock on the door; rap at; rap on

постучать: 74 phrases in 8 subjects

American usage, not spelling	1
British usage, not spelling	3
Dentistry	1
Folklore	1
General	36
Idiomatic	2
Makarov	29
Saying	1