Correct spelling, explanation: the correct form is departed because depart is a regular verb, and its past tense and past participle form follows the standard rule of adding -ed. For example, you would say, She departed from the station at noon or The flight had already departed when we arrived. On the other hand, departured is incorrect because departure is a noun, not a verb. While English does have some nouns ending in -ure (like closure, exposure, or departure), these are not verbs and cannot be conjugated.

Definition of departed:
1. Adjective, refers to someone who has died or something that no longer exists
We cherish the memories of our departed loved ones.
The traditions of the departed era are fading away.
2. Verb (past tense and past participle of depart), to have left a place or to have gone away
The train departed on time.
She departed for Paris early in the morning.

Collocations with departed:
Some of the most commonly used collocations include:
1. Departed from (a place): left a specific location.
The plane departed from London Heathrow at noon.
2. Departed for (a destination): left one place to go to another.
She departed for Paris early in the morning.
3. Dearly departed: a respectful or affectionate way to refer to someone who has died.
We gathered to remember our dearly departed grandmother.
4. Recently departed: someone who has died in the near past.
The family mourned their recently departed uncle.

Incorrect spelling, explanation: the word departured is incorrect because departure is a noun, not a verb, and English does not allow nouns to take past-tense endings like -ed in the way that verbs do. The correct verb is depart, which means to leave or to go away from a place, and its past tense is departed. This mistake may stem from overgeneralization, where learners assume that since some nouns can be turned into verbs, departure should also have a verb form like departured.