POPS
dad IS a 3 letter word for dad...... Pop is another which is an abbreviation for papa .
Sire
pater
tup
dad
Not that I know of, but my dad had a close one, 7 letter word, negated.
dad
'rents
dead dad
Envy Is A 4-Letter Word
Salt is a 4 letter word for seasoning.
4 letter word for final