Four letter Word Game

tart

tarn

barn

warn

wart

warm

ward

card

Care

acre

race

lace

late

lath

halt

hart

harp

hard

hare

mare

ream

Team

mate

tate

tare

hare

Rhea

hear

wear

near

earn

warn

warp

wrap

trap

rapt

I was under the impression that you should change one letter and not mix them up as in an anagram!! Just saying!!.;)

raps

baps

bass