tern / terne / turn are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
tern: (noun) small slender gull having narrow wings and a forked tail.
terne: NA
turn: (noun) the act of changing or reversing the direction of the course. (noun) (game) the activity of doing something in an agreed succession. (noun) an unforeseen development. (noun) the act of turning away or in the opposite direction. (noun) (sports) a division during which one team is on the offensive. (noun) a favor for someone. (noun) taking a short walk out and back. (verb) change orientation or direction, also in the abstract sense. (verb) cause to move around or rotate. (verb) pass to the other side of. (verb) pass into a condition gradually, take on a specific property or attribute; become. (verb) let (something) fall or spill from a container. (verb) move around an axis or a center. (verb) cause to move around a center so as to show another side of. (verb) to send or let go. (verb) shape by rotating on a lathe or cutting device or a wheel. (verb) change color. (verb) cause to change or turn into something different;assume new characteristics. (verb) accomplish by rotating. (verb) get by buying and selling. (verb) cause to move along an axis or into a new direction. (verb) channel one's attention, interest, thought, or attention toward or away from something. (verb) alter the functioning or setting of. (verb) direct at someone. (verb) become officially one year older.
tern: NA
terne: NA
turn: t·ER·n
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)