In zoology|lang=en terms the difference between bladder and gland
is that
bladder is (zoology) a flexible sac that can expand and contract and that holds liquids or gases while
gland is (zoology) an organ that synthesizes a substance, such as hormones or breast milk, and releases it, often into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland).
In botany|lang=en terms the difference between bladder and gland
is that
bladder is (botany) a hollow, inflatable organ of a plant while
gland is (botany) a secretory structure on the surface of an organ.
As nouns the difference between bladder and gland
is that
bladder is (zoology) a flexible sac that can expand and contract and that holds liquids or gases while
gland is (zoology) an organ that synthesizes a substance, such as hormones or breast milk, and releases it, often into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland) or
gland can be (mechanical) a compressable cylindrical case and its contents around a shaft where it passes through a barrier, intended to prevent the passage of a fluid past the barrier examples:.
As a verb bladder
is to swell out like a bladder with air; to inflate.