When discussing conversion, we must remind ourselves that a large number of word in english belong to more than one part of speech.
Words like love words are primarily nouns or verbs.bSimilarly, since can be used as a preposition, as a conjunction and also as an adverb.
He has been ill since Monday.
It is just a fortnight since she got married.
He migrated to Australia in 1960 and lived ever since.