tide / saltwater / opportunity

cow, ox, cattle

back, behind, rear

proprietor; business owner

cohesion (the various intermolecular forces that hold solids and liquids together)

(computing) username

(archaic) the time between and 2:00 AM and 2:30 AM, or between 3:00 AM and 3:30 AM, depending on the timekeeping tradition in use / (poetic, by extension) the middle of the night, late night

the European Union

a category of business; a type of industry

hair on the back of one's head