STUMPERS III

1. Can you think of a five-letter word, such that if you add a single letter at the front of it, you will have a six-letter word meaning almost the same thing?

2. Can you think of a five-letter word, such that it becomes plural when you add an S at the end, but becomes a different word when you add a Z at the end?

HINTS:
1. The word contains the consecutive letters SH.

2. The word contains the consecutive letters ART.

BIG HINT:
1 and 2. Both words begin with Q.

Answers:

1. QUASH/SQUASH

2. QUART/QUARTS - QUARTZ