Geology. Depends on what you mean. There are many. This is just an example.
Forces
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science words that starts with a
A science word that starts with the letter "i" might include ichnomancy or ions. Other science words beginning with this letter could include indium and indicator.
Another term for applied science is technology, because technology is science that is used to create stuff.
Forces
Geometry
Velocity.
heterogeneous homogeneous
There is none!
geometry
Gas is a science word. Gravity is a science word.
· thermal radiation · thermochemistry · titration · titanium
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Granary.
Science is a very broad term. However, what comes up in my mind is the chemical Nitrogen.
Quantum, quark, and quicksilver all avail you.