pep (n.)

• aggressiveness
• animation
• bang
• birr
• breeziness
• briskness
• bubbliness
• dash
• drive
• ebullience
• effervescence
• energy
• enterprise
• fire
• get-up-and-go
• getup
• ginger
• go
• hardihood
• initiative
• kick
• life
• liveliness
• moxie
• pepper
• peppiness
• piquancy
• pizzazz
• poignancy
• poop
• potency
• punch
• pungency
• push
• raciness
• snap
• sparkle
• spirit
• spiritedness
• sprightliness
• spunk
• starch
• thrust
• tuck
• verve
• vigor
• vim
• vitality
• vivacity
• vividness
• zing
• zip