Four letter words--Change 0 to 1 letter to make a new word

Sire :prince:t2:

iris :rainbow:

Siri :robot:

sirs :adult: :blonde_man: :man: :bearded_person: :man_red_haired:

airs :notes:

Iraq :desert:

raid.

Dray :truck:
(Close enough)

pray :pray:

pram :pregnant_woman:

romp :grinning:

Rome :prince:

Eros.

rose :rose:

rote :unamused:

note :notes:

tote :basket:

toot :saxophone:

boot :boot:

toon :space_invader: