common*
Here are some words that match your criteria:

- common
- common ageratum
- common alder
- common allamanda
- common American shad
- common amsinckia
- common apricot
- common arrowhead
- common ax
- common axe
- common bamboo
- common barberry
- common barley
- common basil
- common bean
- common bean plant
- common bearberry
- common beech
- common beet
- common bile duct
- common birch
- common bird cherry
- common blackfish
- common bog rosemary
- common booklouse
- common box
- common brant goose
- common broom
- common burdock
- common buttercup
- common calamint
- common camas
- common canary
- common caper
- common cardinal vein
- common carline thistle
- common carotid
- common carotid artery
- common carrier
- common chickweed
- common chord
- common cockscomb
- common cold
- common comfrey
- common coral tree
- common corn salad
- common cotton grass
- common daisy
- common dandelion
- common denominator
- common devil's claw
- common divisor
- common dogbane
- common dolphin
- common duckweed
- common eel
- common eland
- common elder
- Common era
- common European ash
- common European dogwood
- common European earwig
- common European jay
- common evening primrose
- common facial vein
- common factor
- common fate
- common fault
- common fennel
- common fig
- common fig tree
- common flat pea
- common four-o'clock
- common foxglove
- common fraction
- common front
- common garden cress
- common garter snake
- common ginger
- common good
- common grape hyacinth
- common grape vine
- common ground
- common gum cistus
- common heath
- common hop
- common hops
- common horehound
- common horsetail
- common hyacinth
- common iguana
- common iliac artery
- common iliac vein
- common ivy
- common jasmine
- common juniper
- common kingsnake
- common knowledge
- common laburnum
- common lady's-slipper