1. What do the following words have in common?

FIRE
CARE
PEAK
VALOR
RABBLE

2. What do the following words have in common?

DO
FLU
HAS
OPERA

HINTS:
1)
#1: The first letter of each word has to be dropped.
#2: The first letters need to be replaced by the same three letters.

2. The same two letters will change each word into a new one.

Answers:

1. Dropping the first letter of each word and replacing it with SQU creates a new word:

SQUIRE / SQUARE / SQUEAK / SQUALOR / SQUABBLE 

2. Each word can be followed by TE to make new words:

DOTE / FLUTE / HASTE / OPERATE