1. Two four-letter words differ only by their initial letter. One means seep and the other means sleep. What are the words?

2. The two six-letter words that answer this flat differ only by their initial letter.

An ingenue's
Not _ _ _ _ _ _  by  _ _ _ _ _ _

HINT:
2: Not  M _ _ _ _ _  by  N _ _ _ _ _

Answers:

1. OOZE - DOZE 
2. MATURE - NATURE

Credit:
2: The Enigma 
    June, 2020
    LEXMAN