Incorrect spelling, explanation: the noun departure refers to the act of leaving, as in His departure was unexpected, but it cannot function as a verb. English does not follow a rule where every noun can simply be turned into a verb by adding -ed. While some nouns and verbs share similar forms (such as walk as both a noun and a verb), departure does not have a corresponding verb form ending in -ed. English already has a verb (depart) that serves the intended meaning, making departured unnecessary and incorrect.

Correct spelling, explanation: the word departed comes from the verb depart, which itself originates from the Old French departir, which in turn comes from Latin departire or departiri, meaning to divide. Over time, the meaning of depart shifted from to separate to to leave, which is its primary sense in modern English. The past tense of depart is departed, following the regular English pattern for past-tense verb forms. On the other hand, departured is not a correct word in English because departure is a noun, not a verb.

Definition of departed:
1. Adjective, having died especially recently
She placed fresh flowers on the grave of her departed grandmother, whispering a silent prayer.
The soldiers honored their departed comrades with a solemn ceremony.
2. Verb (past tense and past participle of depart), leave, especially in order to start a journey
The flight departed on time, heading for Paris without any delays.
He departed the meeting early, citing an urgent personal matter.

Collocations with departed:
Some of the most commonly used collocations include:
1. Departed this life: a formal or poetic way of saying “died”.
He departed this life peacefully in his sleep.
2. The departed: a general term for people who have passed away.
A moment of silence was observed for the departed.
3. Departed early: left a place sooner than expected or planned.
He departed early from the meeting due to a prior engagement.
4. Departed peacefully: died in a calm, serene manner, often used in relation to death.
The elderly woman departed peacefully in her sleep.