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Answer: supersymmetries
Answer	Crossword Clue
supersymmetries	hypothetical symmetry among groups of particles containing fermions and bosons, esp. in theories of gravity (supergravity) that unify electromagnetism, the weak force, and the strong force with gravity into a single unified force
supersymmetries	SUPERSYMMETRY, the correspondence between fermions and bosons of identical mass that is postulated to have existed during the opening moments of the big bang and that relates gravity to the other forces of nature

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a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: supersymmetries