The most common and most likely answer to this crossword clue is the 6 letter word GEYSER which also is the latest solution we found used in New York Times in 1961.
"Old Faithful" crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| GEYSER | 100 % | 6 | 
Words with a meaning similar to the clue: "Old Faithful"
These words may or may not be a possible solution to this crosswords clue.- yellowstone
 - great falls
 - yosemite
 - twin falls
 - el capitan
 - grand falls
 - sulfur works
 - niland geyser
 - beaver falls
 - eyjafjallajökull
 - mount st. helens
 - paint creek
 
Crossword Answer definitions
GEYSER noun- A boiling natural spring which throws forth at frequent intervals jets of water, mud etc., driven up by the expansive power of steam.
 - An instantaneous, and often dangerous, hot water heater.
 - A domestic water boiler.
 
- To (cause to) rush or burst upward like water from a geyser.
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution