Words that Begin with a Mode of Transport

(Train)ing, (Bus)t, (Sled)gehammer, (Car)te Blanch.

Carbonate Rocks

Calcite, Limestone, Aragonite, Dolomite.

Words with Hidden Evil Creatures

(Demon)stration, pr(ogre)ss, t(orc)h, (Imp)unity.

'Imp Unity' is also an Imp Rights Movement keyphrase.

Colors in Literature

The Yellow Wallpaper, The Red Badge of Courage, The Scarlet Letter, The Color Purple.