boat
Rail.
A duck and a swan are both water birds with four letters.
lake
the java sea lake, pond
It only uses four different letters. It uses a total of 7 letters because the A is used 4 times. So 4 different letters and the A used 3 more times than that.
Some four-letter synonyms for "road" include "lane," "path," and "way." Each of these words can refer to a route or thoroughfare used for travel.
panther
CRAB
The letters can be used in spelling the 4 letter words dots and dust. They also are used in the word stud.
Answer: EURO ( used in most of Europe).
Bale or Rick as in hayrick
Sound travels at a speed of approximately 1,500 meters per second in water. Therefore, in 4 seconds, sound would travel approximately 6,000 meters through water.