The first part of my first part? You should already know.
The last part of my first part, is men’s most common foe.
The whole of my first part, weird as it might be,
Is the lack of my first part’s last part. There, you see?
The first part of my last part is the first part of many,
Of mussels, of waivers, of school sessions aplenty.
The last part of my last part is the last part of more,
Of a field, and one’s height, and a beast you abhor.
The whole of my last part isn’t an actual word,
But rhymes with the whole of plants, bugs, squirrels, and birds.
Combined all my parts, and together they yield:
The secrets one needs to enter a field
2 Answers
Is it
Nomenclature
The first part of my first part? You should already know.
Not 100% sure on reasoning of this part, but No is a homophone of "know".
The last part of my first part is men's most common foe.
Men are men's own most common enemy Thanks @jafe!
The whole of my first part, weird as it might be, Is the lack of my first part’s last part. There, you see?
Nomen. Just "no men".
The first part of my last part is the first part of many, Of mussels, of waivers, of school sessions aplenty.
Clams, Clauses, Classes Thanks @jafe for this part too!
The last part of my last part is the last part of more, Of a field, and one’s height, and a beast you abhor.
Pasture, Stature, Creature.
The whole of my last part isn’t an actual word, But rhymes with the whole of plants, bugs, squirrels, and birds.
Clature. Not a word, but rhymes with "Nature"
Combined all my parts, and together they yield: The secrets one needs to enter a field
Nomenclature. The body or system of names used in a particular specialist field.
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1$\begingroup$ Nicely done, Timoris! Props to @jafe for solving some of the clues as well. You're right on with your logic in every line $\endgroup$– BelgabadNov 30, 2018 at 14:21
Partial
The last part of my first part, is men’s most common foe.
A man's most common enemy is the man himself.
The whole of my first part, weird as it might be,
Is the lack of my first part’s last part. There, you see?
Lack of "man", ending with "man"... Maybe woman?
The first part of my last part is the first part of many,
Of mussels, of waivers, of school sessions aplenty.
Clams, clauses and classes all begin with cla.