blueberry
a small sweet blue fruit
She picked a handful of ripe blueberries from the bush.
bluebird
a small songbird with bright blue plumage
A bluebird landed on the windowsill and sang.
bluebell
a bell-shaped wildflower that is typically blue
In spring the woods were covered in bluebells.
blueprint
a detailed plan or technical drawing
Before building began, they reviewed the blueprint carefully.
blue-collar
relating to manual or industrial workers
He grew up in a blue-collar neighborhood.
bluegrass
a style of American country music featuring string instruments
They enjoyed an evening of bluegrass and folk songs.
bluefin
referring to tuna species with blue-tinted fins (e.g., bluefin tuna)
Bluefin tuna are highly valued in many cuisines.
true-blue
loyal, faithful, or steadfast
He's a true-blue friend who always supports you.
sky-blue
a pale blue color like that of the clear sky
She chose a sky-blue dress for the party.
blue-eyed
having blue eyes; sometimes used figuratively
The blue-eyed toddler giggled at the puppy.