Correct spelling, explanation: in Old English, the word for life was līf, and its plural form was līf or līfum. During the Middle English period (approximately 12th to 15th centuries), the word life evolved, and its plural form became lives. It’s considered an irregular noun because it doesn’t follow the standard pattern of adding -s or -es to form plurals, which is common for most nouns in Modern English. Remember that lifes is just a mistake.

Definition of lives:
noun (plural), more than one instance or the existence of living beings, often used to describe the experiences, activities, or biographies of individual people or organisms
The book explores the lives of famous scientists throughout history.
The documentary showcases the lives of endangered species in the rainforest.

Collocations with :
Some most commonly used collocations include:
1. Healthy lives: signifies a lifestyle focused on well-being and includes habits like exercising regularly, eating healthily, and taking care of one’s physical and mental health.
Regular exercise and a balanced diet contribute to healthy lives.
2. Creative lives: relates to the artistic or imaginative aspects of a person’s life, where they engage in creative pursuits such as writing, painting, or composing music.
Artists often draw inspiration from their own creative lives and experiences.
3. Double lives: describes a situation in which a person leads two separate and often secret existences or identities, such as a spy with a hidden persona.
The spy led a double life, with a secret identity known to only a few.
4. Family lives: encompasses the dynamics and experiences within a family, including relationships between family members and the activities they engage in together.
Family lives can be complex, with various dynamics and relationships to navigate.

Incorrect spelling, explanation: the plural form of life is lives and that is the only correct version. Most nouns in English form their plurals by adding the suffix -s or -es to the singular form. However, there are some irregular nouns that do not follow this pattern, and life is one of them. Irregular nouns have unique forms for their plurals that are not based on the typical -s or -es suffix. This irregularity is a feature of the English language, and it is important to learn these irregular plurals because they do not follow the standard rules.