As nouns the difference between lens and opsiometer

is that lens is lentil while opsiometer is an old instrument for measuring vision and determining the focal length of a lens that can correct an individual's imperfect eyesight.

As nouns the difference between eyesight and opsiometer

is that eyesight is vision or the faculty of sight while opsiometer is an old instrument for measuring vision and determining the focal length of a lens that can correct an individual's imperfect eyesight.

As a noun sponge

is (countable) any of various marine invertebrates, mostly of the phylum porifera , that have a porous skeleton often of silica.

As a verb sponge

is (slang) to take advantage of the kindness of others.

As an adjective spongoid is

resembling sponge.

As nouns the difference between instrument and curvilinead

is that instrument is while curvilinead is (geometry|obsolete) an instrument for drawing curved lines.

As nouns the difference between joint and hydrarthrosis

is that joint is marijuana cigarette; joint while hydrarthrosis is (medicine) an effusion of watery liquid into the cavity of a joint.

As adjectives the difference between unfertilized and impregnant

is that unfertilized is not fertilized while impregnant is (obsolete) not pregnant; unfertilized or infertile.

As a noun impregnant is

(obsolete) that which impregnates.

As adjectives the difference between infertile and impregnant

is that infertile is not fertile while impregnant is (obsolete) not pregnant; unfertilized or infertile.

As a noun impregnant is

(obsolete) that which impregnates.

As nouns the difference between instrument and opsiometer

is that instrument is while opsiometer is an old instrument for measuring vision and determining the focal length of a lens that can correct an individual's imperfect eyesight.

As a noun king

is a male monarch; a man who heads a monarchy. If it's an absolute monarchy, then he is the supreme ruler of his nation.

As a verb king

is to crown king, to make (a person) king.

As a proper noun King

is the title of a king.

As an adjective kingdomed is

having a specified type or number of kingdoms.

In medicine|lang=en terms the difference between effusion and hydrarthrosis

is that effusion is (medicine) the seeping of fluid into a body cavity; the fluid itself while hydrarthrosis is (medicine) an effusion of watery liquid into the cavity of a joint.

As nouns the difference between effusion and hydrarthrosis

is that effusion is a liquid outpouring while hydrarthrosis is (medicine) an effusion of watery liquid into the cavity of a joint.