Ruby and Rust

ruby

A transparent piece of ruby that has been cut and polished and is valued as a precious gem.
A transparent deep red variety of corundum; used as a gemstone and in lasers.
A deep and vivid red color.
- synonyms: crimson, deep red

Of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies.
- synonyms: red, reddish, ruddy, blood-red, carmine, cerise, cherry, cherry-red, crimson, ruby-red, scarlet

(n.) Any species of South American humming birds of the genus Clytolaema. The males have a ruby-colored throat or breast.
(n.) A precious stone of a carmine red color, sometimes verging to violet or intermediate between carmine and hyacinth red. It is a red crystallized variety of corundum.
(n.) See Agate, n., 2.
(v.t.) To make red; to redden.
(n.) The color of a ruby; carmine red; a red tint.
(n.) That which has the color of the ruby, as red wine. Hence, a red blain or carbuncle.
(a.) Ruby-colored; red; as, ruby lips.

Webster's Revised Unabridged Dictionary

Ruby is a feminine given name

rust

A red or brown oxide coating on iron or steel caused by the action of oxygen and moisture.
A plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi.
The formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water.
- synonyms: rusting
Any of various fungi causing rust disease in plants.
- synonyms: rust fungus

Become destroyed by water, air, or a corrosive such as an acid.
- usage: "The metal corroded"; "The pipes rusted"
- synonyms: corrode
Cause to deteriorate due to the action of water, air, or an acid.
- usage: "The acid corroded the metal"; "The steady dripping of water rusted the metal stopper in the sink"
- synonyms: corrode, eat
Become coated with oxide.

(n.) The reddish yellow coating formed on iron when exposed to moist air, consisting of ferric oxide or hydroxide; hence, by extension, any metallic film of corrosion.
(v.i.) To be affected with the parasitic fungus called rust; also, to acquire a rusty appearance, as plants.
(n.) A minute mold or fungus forming reddish or rusty spots on the leaves and stems of cereal and other grasses (Trichobasis Rubigo-vera), now usually believed to be a form or condition of the corn mildew (Puccinia graminis). As rust, it has solitary reddish spores; as corn mildew, the spores are double and blackish.
(n.) That which resembles rust in appearance or effects.
(n.) Foul matter arising from degeneration; as, rust on salted meat.
(v.i.) To degenerate in idleness; to become dull or impaired by inaction.
(n.) A composition used in making a rust joint. See Rust joint, below.
(v.t.) To cause to contract rust; to corrode with rust; to affect with rust of any kind.
(v.t.) To impair by time and inactivity.
(v.i.) To contract rust; to be or become oxidized.
(n.) Corrosive or injurious accretion or influence.

Webster's Revised Unabridged Dictionary

Rust is a masculine given name