Seven letter words change one or two letter to make a new word

[Bayaker]

slipper

[Thin_Ice]

replica

[Biffster]

reptile

[Bayaker]

tippler

[Thin_Ice]

realist

[Elendil_s_Heir]

realism

[Thin_Ice]

smaller

[Biffster]

release

[Thin_Ice]

relapse

[panache45]

pleaser

[Thin_Ice]

Pleaser is an anagram of relapse thus no letters were changed, just repositioned.

[Biffster]

Playing off of pleaser—or relapse—take your pick

pleased

[Thin_Ice]

aspired

[Biffster]

desires

[SayrtheSooth]

resists

[Bayaker]

trussed

[Thin_Ice]

brushed

[Biffster]

Brussels

[Annie-Xmas]

Playing off of 7-letter word Brussel:

sellers

[Biffster]

cellars