1. The same five letters, in the same order, can follow the letters below to make words.

D _ _ _ _ _
STR _ _ _ _ _
END _ _ _ _ _

2. The same five letters, in the same order, can follow the letters below to make words

H _ _ _ _ _
W _ _ _ _ _
SL _ _ _ _ _
FR _ _ _ _ _

HINTS:
1 and 2: The five letters form a word of their own.
1. The first letter is A.
2. The first letter is E.

Answers:

1. The letters are  ANGER:

DANGER / STRANGER / ENDANGER

2. The letters are EIGHT:

HEIGHT / WEIGHT / SLEIGHT / FREIGHT