As nouns the difference between thermit and thermet
is that thermit is an alternative spelling of lang=en while thermet is a mixture of a metal and of a ceramic material which has been thermally treated (i.e. a heat-treated cermet).
thermet
English
Noun
(
en noun)
A mixture of a metal and of a ceramic material which has been thermally treated (i.e. a heat-treated cermet).
References
* See for example US Patent 6494566, col. 19, lines 28-37