As nouns the difference between antibiotic and neomycin

is that antibiotic is antibiotic while neomycin is (medicine) a broad-spectrum aminoglycoside antibiotic that is found in many topical medications.

As an adjective antibiotic

is antibiotic.

As nouns the difference between topical and neomycin

is that topical is (pharmacology) a topical anaesthetic while neomycin is (medicine) a broad-spectrum aminoglycoside antibiotic that is found in many topical medications.

As an adjective topical

is of current interest; contemporary.

As nouns the difference between portable and gameboard

is that portable is a portable toilet; a self-contained outhouse while gameboard is a portable surface on which a game is played, and which is marked for play of that game.

As an adjective portable

is able to be carried or easily moved.

As nouns the difference between game and gameboard

is that game is a playful or competitive activity while gameboard is a portable surface on which a game is played, and which is marked for play of that game.

As an adjective game

is (colloquial) willing to participate.

As a verb game

is to gamble.

Board is a synonym of gameboard.

As nouns the difference between board and gameboard

is that board is a relatively long, wide and thin piece of any material, usually wood or similar, often for use in construction or furniture-making or board can be (basketball|informal) a rebound while gameboard is a portable surface on which a game is played, and which is marked for play of that game.

As a verb board

is to step or climb onto or otherwise enter a ship, aircraft, train or other conveyance.

Checkerboard is a hyponym of gameboard.

As nouns the difference between checkerboard and gameboard

is that checkerboard is a pattern of squares of alternating colours while gameboard is a portable surface on which a game is played, and which is marked for play of that game.

As a verb checkerboard

is to checker; to mark with an alternating pattern of light and dark.

As a verb oxidize

is (chemistry|transitive) to combine with oxygen or otherwise make an oxide.

As an adjective nitrifying is

describing certain bacteria that oxidize ammonia to nitrite and nitrate in the soil.

As a noun ammonia

is (inorganic compound) a gaseous compound of hydrogen and nitrogen, nh₃, with a pungent smell and taste.

As an adjective nitrifying is

describing certain bacteria that oxidize ammonia to nitrite and nitrate in the soil.

As a noun nitrite

is any salt or ester of nitrous acid.

As an adjective nitrifying is

describing certain bacteria that oxidize ammonia to nitrite and nitrate in the soil.

As a noun nitrate

is .

As an adjective nitrifying is

describing certain bacteria that oxidize ammonia to nitrite and nitrate in the soil.