chatham (Hebrew #2856)
to close up; especially to seal
KJV usage: make an end, mark, seal (up), stop.
Pronounce: khaw-tham'
Origin: a primitive root
tamam (Hebrew #8552)
to complete, in a good or a bad sense, literal, or figurative, transitive or intransitive (as follows)
KJV usage: accomplish, cease, be clean (pass-)ed, consume, have done, (come to an, have an, make an) end, fail, come to the full, be all gone, X be all here, be (make) perfect, be spent, sum, be (shew self) upright, be wasted, whole.
Pronounce: taw-mam'
Origin: a primitive root