Reconstruction:Proto-Germanic/fōr

Etymology
From ~.

Noun

 * 1)  fire

Inflection
The original heteroclitic alternation of r/n is preserved.

Simms posits several stages of development of this word. Since no single paradigm can be asserted for Proto-Germanic at any given point in time, the developments are detailed below.

Paradigm 1: The original paradigm as inherited from PIE.

Paradigm 2: An alternative paradigm was later formed based on the stem *fu- and regular n-stem endings. The two formations coexisted side by side for a period.

Paradigm 3: At a certain point in time, the two paradigms above were blended, attaching n-stem endings to the stem *fun-. Paradigm 1 was lost after that, paradigms 2 and 3 continued to exist side by side.

After the above stages, paradigms 2 and 3 finally split. In paradigm 2 the -r- was generalised to all forms, creating *fōr, *fuïr-, which is found in North and West Germanic. In paradigm 3, the -n- was generalised to the nominative, creating *fōn, *funin- as found in Gothic and in the Old Norse form.