by its very nature (adverb) per se: essentially
Sinonime: -nouns
correpondence, letter, epistle, note, billet, post card, missive, circular, favor, billet-doux; chit, chitty, letter card, picture post card; postal, postal card; despatch; dispatch; bulletin, these presents; rescript, rescription; post (messenger).
-verbs
correspond with; write to, send a letter to; keep up a correspondence; post a letter to.
-adjectives
epistolary.
-phrases
furor scribendi.