Part of speech: Adjective (satellite)
occurring at the beginning
Example: took the initial step toward reconciliation
Part of speech: Noun
the first letter of a word (especially a person's name)
Example: he refused to put the initials FRS after his name
Part of speech: Verb
mark with one's initials
initial – A related word in the same word family.
er – A related word in the same word family.
Some English words are 'fossil words'—they only survive in idioms or fixed phrases.