Fusion
Flares is a space word. It begins with the letter f.
What engineers start with the letter F?
· full moon - free fall - far side of the moon - solar faculae - Fraunhofer lines
Flares and a full moon are observed in space. They begin with the letter f.
Space related word is "Astronaut"
Fear
· full moon
Flares are a space word. It begins with the letter f.
Further
MUSK
Foresaw is a word. It begins with f and ends with aw.
Facsmile