pullulate (v.)

• abound
• beget
• blossom
• brew
• bud
• burgeon
• clutter
• crawl
• crowd
• develop
• engender
• fill
• flood
• flourish
• flow
• fructify
• gather
• germinate
• grow
• hypertrophy
• increase
• jam
• leaf
• leave
• luxuriate
• mature
• multiply
• mushroom
• outgrow
• overflow
• overgrow
• overrun
• overspread
• overtop
• pack
• procreate
• proliferate
• reproduce
• riot
• root
• shoot
• sprout
• swarm
• teem
• thrive
• tower
• vegetate
• wax