fer·ment·er 
(fər-mĕntər)
(fər-mĕntər)n.
1. An organism that causes fermentation.
2. also fer·men·tor An apparatus that maintains optimal conditions for the growth of microorganisms, used in large-scale fermentation and in the commercial production of antibiotics and hormones.
- unflinchingness
- unfocused
- unfocussed
- unfold
- unfoldment
- unforeseen
- unforgettability
- unforgettable
- unforgettableness
- unforgettably
- unforgivable
- unforgiving
- unformatted
- unformed
- unfortunate
- unfortunately
- unfounded
- unfoundedly
- unfoundedness
- unfreeze
- unfrequented
- unfriend
- unfriended
- unfriendliness
- unfriendly