Short Answer 
The word “distra” is a verb, specifically the past participle of “distract,” indicating a mental disturbance from external factors. Collective nouns like “vendors” or “street sellers” describe groups selling items publicly, and singular nouns such as “onion” and “tomato” become plural by adding “s” or “es.”
Step 1: Understanding the Verb
In the provided sentence, the underlined word “distra” functions as a verb, specifically a past participle of “distract.” This verb conveys an action where someone’s attention is diverted or disturbed, highlighting a mental disturbance caused by an external factor.
Step 2: Identifying Collective Nouns
The term used to describe individuals selling items on the streets is known as a collective noun. In this context, both “vendors” and “street sellers” are appropriate, representing a group that engages in commerce in public spaces.
Step 3: Forming Plural Nouns
To convert singular nouns into their plural forms, specific rules apply. For instance, the singular terms “onion” and “tomato” become “onions” and “tomatoes”, respectively, by simply adding an “s” or “es” at the end to indicate that there is more than one.