Roots and Derivatives

anni, annu, enni (year): anniversary, semiannual, biennial, bicentennial, annuity
aqua, aque (water): aquatic, aqueduct, aquarium, aqualung, subaqueous, aquamarine
arm (arm, weapon): army, alarm, disarm, armaments, armory, armor
art (art, craft, skill): artistic, artificial, inarticulate, artmobile, article, artifices

Word List

1. aqua: the hue of the sea:, bluish-green.  
2. aquaculture: the cultivation of water plants and animals for human food.
3. aqueous: like, of, or formed by water: watery. 
4. armada: a fleet of worships. 
5. armature: equipment or clothing for battle, or any protective covering; an armlike extension
6. armistice: a temporary suspension of hostilities by mutual agreement, as a truce preliminary to a peace treaty.
7. artifact: any object produced by the art of the human hand; simple or primitive objects from the distant past. 
8. artifice: cunning ingenuity; cleaver or sly trickery. 
9. artisan: a person skilled at a craft, usually a handicraft. 
10. millennium: a period of peace and great prosperity; a thousand years. 
11. perennial: year after year; throughout the years; n, a plant that blooms annually. 
12. superannuated: worn out, or retired, from age and years of use of hard work; obsolete or outdated.