serious vs severe

serious and severe both are adjectives.

Word	Noun	Adjective	Verb	Adverb
serious	No	Yes	No	No
severe	No	Yes	No	No

As adjectives, serious and severe are synonyms defined as:

Other synonyms of serious include dangerous, grave, grievous, life-threatening.

serious (adjective)	severe (adjective)
concerned with work or important matters rather than play or trivialities	causing fear or anxiety by threatening great harm
completely lacking in playfulness	intensely or extremely bad or unpleasant in degree or quality
causing fear or anxiety by threatening great harm	severely simple
requiring effort or concentration; complex and not easy to answer or solve	very strong or vigorous
of great consequence	very bad in degree or extent
appealing to the mind	unsparing and uncompromising in discipline or judgment