genus /jēˈnəs or jenˈəs/

1. A taxonomic group of lower rank than a family, consisting of closely related species, in extreme cases of one species only (biology)
2. A class of objects comprehending several subordinate species (logic)

• the Eternal City
• the eternal feminine
• the eternal triangle
• the eternities
• the Evil One
• the exception proves the rule
• the fact of the matter
• the fairer sex
• the fair sex
• the Faithful
• the fancy
• the fatal sisters
• the fat is in the fire
• the feudal system
• the few
• the Fifteen
• the final solution
• the fine arts
• the fiscal question
• the five Ks
• the five wits
• the flat
• the Fleet
• the Flood
• the flowery land