GENDER ISSUES (not original title)

Credit: NY Times Crossword - Sept. 22, 2002

Alan Arbesfeld (Idea and #1-4)

What do the following words have in common?

1. MOUNTAIN

2. MISSION

3. MASTER

4. METAL

5. MIDDLE

6. MORBID

Answers:

The initial letter of each word (M) can be changed to F to create a new word.