1. What do the following words have in common?

TENDER
COURT
SQUARE

2. What do the following words have in common, other than starting with A?

ACE
ACID
AID
AGUE
ANT

HINTS:
1. It has to do with measurement.
2. Each word can be preceded by the same two letters.

Answers:

1. Each word can be followed with a unit of measure:

TENDERFOOT
COURTYARD
SQUARE MILE

2. Each word can be preceded by PL:

PLACE
PLACID
PLAID
PLAGUE
PLANT