I’m listing up 4 words today but the first pair (かこ and かっこ) and the last pair (かこう and かっこう) sound quite different because of the intonation.
The first pair かこ and かっこ goes down while かこう and かっこう go up. The small っ works like a staccato in music. Listen to the audio clips to feel the differences.
恰好（かっこう）: a shape, appearance