To put it mildly

All words relate to the concept of 'To put it mildly'

Think about what these words have in common

Look for the Spangram - it often reveals the theme

Theme words range from 4 to 8 letters long

Watch for words starting with D, F, G

The Spangram might be a compound or phrase (10 letters total)

One word: D______ (4 letters, starts with 'D')

Another word: F______ (5 letters)

Also look for: G______ (8 letters)