The noun lettuce is an uncountable noun as a word for a food substance.
Units of lettuce are expressed by using a partitive noun(also called a noun counter) is a noun to count or quantify an uncountable noun; for example, heads of lettuce or leaves of lettuce.
The plural noun 'lettuces' is a word for 'type of' or 'kinds of' lettuce; for example, "The lettuces we grow are romaine and endive."
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The noun 'lettuce' is an uncountable noun as a word for a food substance.
Units of lettuce are expressed by using a partitive noun(also called a noun counter) is a noun to count or quantify an uncountable noun; for example, heads of lettuce or leaves of lettuce.
The plural noun 'lettuces' is a word for 'type of' or 'kinds of' lettuce; for example, "The lettuces we grow are romaine and endive."
The noun 'salad' is a countable noun, the plural form is salads.
Example: I made individual salads for dinner. I made a special salad for you.