situation vs locus

situation and locus both are nouns.

Word	Noun	Adjective	Verb	Adverb
situation	Yes	No	No	No
locus	Yes	No	No	No

As nouns, locus is a hyponym of situation; that is, locus is a word with a more specific, narrower meaning than situation:

situation (noun)	locus (noun)
a job in an organization	the set of all points or lines that satisfy or are determined by specific conditions
physical position in relation to the surroundings	the scene of any event or action (especially the place of a meeting)
the general state of things; the combination of circumstances at a given time	the specific site of a particular gene on its chromosome
a condition or position in which you find yourself
a complex or critical or unusual difficulty