nidus vs focal point

nidus and focal point both are nouns.

Word	Noun	Adjective	Verb	Adverb
nidus	Yes	No	No	No
focal point	Yes	No	No	No

As nouns, nidus and focal point are synonyms defined as:

nidus and focal point: a central point or locus of an infection in an organism

Other synonyms of nidus include focus.

nidus (noun)	focal point (noun)
a nest in which spiders or insects deposit their eggs	the concentration of attention or energy on something
a central point or locus of an infection in an organism	a point of convergence of light (or other radiation) or a point from which it diverges
	a central point or locus of an infection in an organism