Seven-letter words - change zero to two letters to make a new word (Part 1)

shrilly

Shirley

shortly

hostile

enlists

cistern

monster

sternly

western

Newport

protein

moister

steroid

strident

-Bzzt!- Eight letters -Bzzt!- Singularity collapsing! -Bzzt!- Anti-matter Moebius loop forming -Bzzt!-
Correction! Correction! Correction!
Ninety-nine bottles of beer on the wall!
spronk

Pfui.

oysters

yogurts

strouds

dossier

Messier

(as in Mark)