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

Lear.

real :upside_down_face:

liar :lying_face:

fair.

fail :frowning_face:

sail.

ails :face_with_thermometer:

salt :salt:

talc.

clap :clap:

flap.

flag :us:

golf :golf:

goal.

Lego.

gone.

gene :dna:

geek.

keen :dagger:

seen :eyes: