Earliest
Part of speech: adjective
Definition: Superlative of early.
Part of speech: adverb
Definition: Superlative of early.
Example sentence: When I first started drawing the earliest incarnation of 'Optic Nerve,' I hadn't even been on a date; I hadn't had a romantic relationship of any kind yet, so in a way, I was almost writing science fiction.
Soonest
Part of speech: adjective
Definition: Short in length of time from the present.
Part of speech: adverb
Definition: Immediately, instantly.Very soon.