spunk (n.)

• adventurousness
• aggression
• aggressiveness
• ambitiousness
• backbone
• bang
• bottle
• bottom
• chutzpah
• courage
• dash
• dauntlessness
• doggedness
• drive
• dynamism
• enterprise
• enterprisingness
• fire
• force
• forcefulness
• gameness
• get-up-and-go
• getup
• ginger
• go
• go-ahead
• grit
• gumption
• guts
• gutsiness
• heart
• hustle
• initiative
• kick
• marrow
• mettle
• mettlesomeness
• moxie
• nerve
• pep
• pepper
• pith
• pizzazz
• pluck
• pluckiness
• poop
• punch
• punk
• push
• pushiness
• resolution
• resolve
• sand
• snap
• spirit
• stamina
• starch
• thrust
• tinder
• tinderbox
• touchwood
• toughness
• venturesomeness
• venturousness
• verve
• vim
• zing
• zip