As verbs the difference between forming and forsing
is that forming is while forsing is (obsolete) to exhaust (oneself) with singing.
As a noun forming
is the act by which something is formed; formation.
forming
English
Verb
(head)
Noun
(
en noun)
The act by which something is formed; formation.
* 1987 , Jeffrey K. Zeig, The Evolution of Psychotherapy
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forsing
English
Verb
(obsolete) To exhaust (oneself) with singing.