ér

• dint, flourish, force, fortitude, kick, might, moment, nerve, pith, potency, power, punch, sinews, strength, stress, sturdiness, vigor, vigour, zip

• eric

• fastness, fortification, fortress, hold, post, stronghold

• athletic, brawny, drastic, fast, firm, forceful, gross, hard, hearty, heavy, hefty, high, hot, husky, intense, large, lusty, mighty, mighty limb, muscular, nervous, nippy, overpowering, potent, powerful, robust, robustful, robustic, robustious, sharp, shrewd, sinewy, smart, solid, stark, stiff, stout, strong, sturdy, thewy, tough, vehement, well-set

• forest, timber, wood, woods

• to arise, arose, arisen, to date, to derive, to emanate, to flow, to issue, to originate, to proceed, to result, to rise, rose, risen, to spawn, to spring, sprang, sprung

• blood vessels

• venous

• to vein

• power plant, power station

• woody

• woody

• resultant

• drip, eaves, weathering

• heath-berry, heather-bell

• to ferment, to work, to yeast

• canopy, cow, diaphragm

• forcefulness, stamina, strength, vent, vigor, vigour

• morality, virtue

• works

• prime mover