Frail:
* Frail: (adj.) weak and delicate; easily damaged or broken.
* Frailty: (n.) the state of being weak and delicate.
* Frailness: (n.) the quality of being frail.
* Frailly: (adv.) in a frail manner.
* Infract: (v.) to break a law or rule.
Fract:
* Fracture: (n.) a break or crack in a bone or other hard substance.
* Fractured: (adj.) broken or cracked; also used metaphorically to describe something that is broken or incomplete.
* Fractious: (adj.) irritable and argumentative.
* Refraction: (n.) the bending of light as it passes from one medium to another.
* Refractive: (adj.) relating to or causing refraction.
Frag:
* Fragile: (adj.) easily broken or damaged.
* Fragility: (n.) the state of being fragile.
* Fragilely: (adv.) in a fragile manner.
* Fragment: (n.) a small piece of something broken off or incomplete.
* Fragmentary: (adj.) consisting of small, incomplete pieces.
* Fragmentation: (n.) the process of breaking something into small pieces.
* Fragrant: (adj.) having a pleasant smell.
* Fragrance: (n.) a pleasant smell.
Other related words:
* Suffrage: (n.) the right to vote. (Derived from the Latin "suffragium," meaning "vote").
* Fray: (v.) to wear away by rubbing or friction. (Related to "fracture").
* Fray: (n.) a fight or argument. (Related to "fractious").
Please note that some of these words may have slightly different meanings depending on context.