The "phrases" below each have the same thing missing. What is it - in a word?

1. RUSUR
2. FISOKS
3. RANCUSE
4. JEWISLIDAY
5. GROWTROMONE

Answer:

Water

Explanation:  Each phrase is missing the letters H, H, and O - or H2O - the chemical formula for water:

1. RUSH HOUR
2. FISH HOOKS
3. RANCH HOUSE
4. JEWISH HOLIDAY
5. GROWTH HORMONE 

Credit: NY Times Crossword
May 8, 2016
David J. Kahn
TRAPPED MOISTURE