Correct spelling, explanation: lives is the plural form of the noun life. You should use it when you are talking about more than one individual’s life. Lifes is not a standard English word, and it is generally considered incorrect. You should avoid using it in your writing or speech. If you encounter lifes in a text, it is likely a typographical error or a non-standard usage. Stick with lives for the plural form of life and remember that it’s the only correct version.

Definition of lives:
noun (plural), more than one existence of a human being or an animal
The lives of the villagers were deeply intertwined, and they supported each other through thick and thin.
In their retirement, they planned to lead adventurous lives, traveling to far-off places and exploring new cultures.

Collocations with lives:
Some most commonly used collocations include:
1. Busy lives: refers to people who have very active and packed schedules with a lot of commitments and activities in their daily routines.
Many people in the city lead busy lives, with hectic work schedules and social commitments.
2. Social lives: describes the social interactions and relationships that individuals have with others, such as spending time with friends, family, or participating in social events.
She values her social life and enjoys spending time with friends and family.
3. Professional lives: refers to the aspects of a person’s life related to their career or job, including work responsibilities, achievements, and goals.
Their professional lives have been dedicated to advancing medical research.
4. Personal lives: represents the non-professional aspects of a person’s life, including their personal interests, hobbies, and relationships outside of work or school.
It’s important to balance your personal life with your career to maintain a healthy lifestyle.

Incorrect spelling, explanation: the reason you can’t spell lifes instead of lives is because lifes is not a correct or standard English word. In this language, when you want to refer to the plural form of the noun life, you should use the word lives. The pluralization of nouns in English follows certain rules, and lives is the appropriate plural form of life. The general rule for forming plurals of nouns is to add an -s to the end of the word. In some cases, when a noun ends in -f or -fe, you change the -f or -fe to -v and add -es to form the plural.