Erstwhile and Of yore

Erstwhile adjective - Having been such at some previous time.

Of yore and erstwhile are semantically related In some cases you can use "Of yore" instead the word "Erstwhile" as an adverb or an adjective.

Erstwhile and of yore are semantically related in old topic. You can use "Erstwhile" instead the phrase "Of yore" as an adjective or an adverb, if it concerns topics such as in the past, previous in time or order, previously in time or order. obsolete substitute