Incorrect spelling, explanation: the pronunciation of marshmallow sounds similar to marshmellow. The ending sound -mallow is easily heard and misinterpreted as -mellow, a more common English word. The word mellow is a familiar term in English, and people may subconsciously substitute the unfamiliar mallow with the familiar mellow. Since marshmallow is often associated with specific contexts (e.g., cooking, camping), it might not be as commonly encountered in writing as other words.

Correct spelling, explanation: the etymology of the words marshmallow and marshmellow clarifies why marshmallow is the correct form and marshmellow is a common misspelling without any etymological basis. The first part of the word marshmallow comes from the marsh plant’s natural habitat. The plant, specifically Althaea officinalis, grows in marshy areas. The second part of the word comes from the mallow plant itself. The mallow plant has been used historically for its medicinal properties, and the root was originally used to make the sweet treat we know today. The term marshmellow does not have any etymological roots or historical significance.

Definition of marshmallow:
Noun, a type of soft, spongy confectionery made primarily from sugar, water, and gelatin
The marshmallow plant, Althaea officinalis, has been used for centuries for its medicinal properties.
She topped her sweet potato casserole with a layer of marshmallows, which turned golden brown and gooey in the oven.

Collocations with marshmallow:
Some of the most commonly used collocations include:
1. Marshmallow peep: a type of marshmallow candy shaped like chicks or other animals, popular during Easter.
Kids love to find brightly colored marshmallow peeps in their Easter baskets.
2. Roasted marshmallow: a marshmallow cooked over an open flame until it is browned or charred.
The best part of camping is making roasted marshmallows for s’mores.
3. Marshmallow treat: a snack or dessert made primarily from marshmallows, such as rice crispy treats.
She made a batch of marshmallow treats for the bake sale at school.
4. Marshmallow filling: a filling made from marshmallows, often used in baked goods and confections.
The chocolate cupcakes had a surprise marshmallow filling that everyone loved.