act

aged

agile

agility

bite

bow

bright

brisk

briskness

cat

catch

cheer

cheerful

cheery

childhood

cord

elderly

forward

frisk

frolic

gambol

gear

glad

gnaw

good

grab

grasp

gray

grey

happy

jolly

jovial

lashing

line

lively

look

merry

nibble

nimble

off

old

pace

perform

play

pleased

rate

rejoice

ribbon

rollick

romp

rope

sharp

smart

snap

speed

spirit

sport

sprightly

spring

sting

string

velocity

years