This a wiki post to gather ideas. Feel free to use it in your answer !
First Oppogram
abnormal original ignore plagiarise (2 words, 16 letters)
Opposite ideas :
abnormal -> normal (6) // typic (5) // usual (5) // norm (4)
original -> copy (4) // used (4) // old (3) // tail (4) // banal (5) // fake (4) // faux (4)
ignore/dismiss -> know (4) // heed (4) // attend (6) // note (4) // keep (4)
plagiarise -> create (6) // renew (5) // give (4) // cite (4)
Word ideas :
Chemistry terms (16 letters) from wikipedia glossary
activation energy
addition reaction
buffered solution
chemical reaction
conjugated system
molecular formula
molecular orbital
organic chemistry
Quantum mechanics
radioactive decay
reactivity series
Physics (16) from glossary of physics
Absolute Humidity
Absolute pressure
Adiabatic cooling
Adiabatic heating
Angular frequency
Astronomical unit
Avogadro constant
Babinet Principle
Centrifugal force
Centripetal force
Covalent compound
Definite integral
Emission spectrum
Fermats principle
Hamilton princple
Laplace transform
Linear elasticity
Liouville theorem
Mass spectrometry
Materials science
Maxwell equations
Mechanical filter
Molecular physics
Phase equilibrium
Physical quantity
Quantum mechanics
Rotational energy
Thermal radiation
Utility frequency
Variable resistor
Third Oppogram :
straighten lazy shack (2 words, 14 letters)
Opposite ideas
straighten -> bend (4) // move (4) // curve (5) // twist (5) // warp (4) // fold (4)
lazy / dull -> fresh (5) // lively (6) // active (6) // keen (4) // eager (5)
shack -> manor (5) // castle (6) // mansion (7) // villa (5) // home (4) // house (5) // palace (6)
Word ideas
Chemistry (14) from wikipedia glossary
activity series
electric charge
saline solution
transition metal
vapour pressure
Physics (14) from glossary of physics
Absolute motion
Amorphous solid
Bessel function
Brownian motion
Circular motion
Current density
Elastic modulus
Electric charge
Escape velocity
Fluid mechanics
Linear actuator
Machine element
Newtonian fluid
Nuclear physics
Planck constant
Quantum physics
Rydberg formula
Solid mechanics
Simple harmonic
Structural load
Surface tension
Tensile modulus
Volta potential