Sub is one word, grade is another.
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"Subgrade" is typically written as one word when referring to the layer of soil or aggregate material beneath a road or structure.
The word "submarine" is an example of a word with the prefix "sub."
No, "submerge" is not a compound word. It is a single word made up of the prefix "sub-" meaning under and the root "merge" meaning to plunge into something.
The suffix of the word "grade" is "-e."
The prefix "sub-" in the word subconscious means "below" or "underneath." So, subconscious refers to thoughts or feelings existing or occurring in the mind without one's full awareness.
"Sub reason" is not a commonly recognized compound word in the English language. It does not have a defined meaning or use in general communication.