The nouns 'work' and 'etiquette' are both uncountable nouns. The term 'work etiquette' is an abstract noun, a term for a concept, an uncountable noun.
Note: The plural form 'works' is a count noun, a word for something produced; for example the artist's best work or all of the author's works.
Etiquettes
The word etiquette is a noun. The plural form is etiquettes.
The word etiquette is a noun. Nouns don't have tenses. Nouns are singular or plural, common or proper, concrete or abstract. Verbs have tenses, there is no verb form for etiquette. The noun etiquette is a singular, common, abstract noun.
The plural form is maids of all work.
The plural form of work chair is work chairs.
The plural form for the noun work is works. Example:The works of William Shakespeare sometimes need translation for modern English speakers.
The plural form of the noun elf is elves.The plural possessive form is elves'.Example: The elves' work is mischief. (the work of the elves)
The plural form of the compound noun 'work company' is:work companies
homework
The plural form of work inductee is work inductees.The plural possessive form is work inductees'.example: All of our work inductees' uniforms are provided by the company.
The plural form for the noun wish is wishes. The plural possessive form is wishes'.Example: All of my wishes' fulfillment is the result of hard work.
The plural form for the noun classmate is classmates.The plural possessive form is classmates'.Example: The classmates' hard work was easy to see in their project.