Plentiful, Copious
Hydrogen and helium are the most abundant elements in stars.
The two most abundant resources of Eastern Central Europe are coal and forests.
redundant, abundant
Assuming the question is for computers, on Excel go to Edit then click on Replace. A box appears with Find what: Replace with: so fill in those two boxes then click on Replace.
Ionized hydrogen and helium are the most abundant chemical elements in nebulae.
The two most abundant elements in a main sequenced star are Hydrogen(H) and Helium(He).
An apostrophe.
hydrogen and oxygen
Iron
The two most abundant elements in the Earth's crust are: Oxygen (46.1%/461,000ppm), and Silicon (28.2%/282,000ppm).
Abundant is a synonym for big. It begins with the letter a.
Abundant, large and substantial are words. Those are the opposite of considerable.