Does the word endure has adverb form?

No, the word "endure" is a verb, and verbs don't have adverb forms.

However, you can use adverbs to modify the verb "endure." For example:

* They endured the pain bravely. (The adverb "bravely" modifies the verb "endured.")

* She endured the long journey patiently. (The adverb "patiently" modifies the verb "endured.")

If you're looking for a word that describes the quality of enduring, you could use adjectives like:

* Tenacious

* Resilient

* Persistent

* Strong