Correct spelling, explanation: both crimson and scarlet are correct words, and they are both used to describe a shade of red. However, they are not always interchangeable, as they can refer to slightly different shades of red depending on context and interpretation. Crimson is often associated with a deep, dark red color, sometimes with a hint of purple or blue. It can be a rich, intense red color. Scarlet typically refers to a bright, vivid red color, often with a slightly orange or fiery hue. It is a bold, striking shade of red.

Definition of crimson:
1. noun, a rich deep red color inclining to purple
The artist mixed red and blue to create a vibrant crimson for his latest painting.
The deep crimson of the roses in the garden added a burst of color to the landscape.
2. adjective, of a rich deep red color inclining to purple
The crimson leaves of the maple tree signaled the arrival of autumn, painting the landscape in rich, warm hues.
Her cheeks turned a deep crimson when she realized she had made a mistake during her presentation.

Collocations with crimson:
Some most commonly used collocations include:
1. Crimson lips: refers to red or deep red lipstick or lip color.
She applied crimson lipstick before heading out for the evening.
2. Crimson carpet: describes a red or deep red carpet often used for special events or premieres.
Celebrities walked down the crimson carpet at the movie premiere.
3. Crimson tide: refers to a term sometimes used to describe a period of intense or significant events or circumstances.
The team faced a crimson tide of challenges during the championship.
4. Crimson banner: indicates a red or deep red flag or banner used for various purposes, including symbolism or decoration.
The crimson banner waved proudly during the parade.

Correct spelling, explanation: the choice between crimson and scarlet depends on the specific shade of red you want to describe, as they refer to slightly different shades. If you’re describing a dark or intense red, crimson might be more appropriate. If you’re describing a bright or vivid red, scarlet could be the better choice. However, keep in mind that both words are somewhat subjective and can be used interchangeably in many contexts, depending on personal interpretation and artistic expression.