[nq:2]No, yes! Those are two other words, but they both end with the same "er" as manor and manner.[/nq]
[nq:1]They do not, nor do 'manor' and 'manner' end with the same 'er' sound.[/nq]
NSOED shows "manor" and "manner" with identical pronunciations, likewise the last syllable of "glimmer", "glamour" and ""grammar": all end with a simple schwa (no 'r' of course in RP BrE).
Alan Jones