Substantial
Part of speech: adjective
Definition: Belonging to substance; actually existing; real; as, substantial life. Not seeming or imaginary; not illusive; real; solid; true; veritable. Corporeal; material; firm. Having good substance; strong; stout; solid; firm; as, substantial cloth; a substantial fence or wall. Possessed of goods or an estate; moderately wealthy; responsible; as, a substantial freeholder. Large in size, quantity, or value; as, a substantial amount of money; vast Most important; essential. Ample or full. Significantly great.
Example sentence: National security is the first duty of government but we are also committed to reversing the substantial erosion of civil liberties.
Material
Part of speech: noun
Definition: Matter which may be shaped or manipulated, particularly in making something.A sample or specimens for study.Cloth to be made into a garment.Things written to be performed.A person who is qualified for a certain position or activity.
Part of speech: adjective
Definition: Having to do with matter.Worldly, as opposed to spiritual.Significant.
Example sentence: Through a long and painful process, I've learned that happiness is an inside job - not based on anything or anyone in the outer material world. I've become a different and better person - not perfect, but still a work in progress.