functor /fungkˈtər/

1. A function, an operator (mathematics)
2. A function word (qv)

• double takes
• double-talk
• doublethink
• doublethinks
• double-threaded screw
• double-threaded screws
• double time
• doubleton
• double-tongue
• double-tongued
• double-tongues
• double-tonguing
• doubletons
• double top
• doubletree
• doubletrees
• doublets
• double-u
• double up
• double vision
• double wedding
• double weddings
• double whammy
• double witching
• double witching hour