As adjectives the difference between silly and airheaded

is that silly is (label) pitiable; deserving of compassion; helpless while airheaded is silly, foolish.

As a noun silly

is (colloquial) a silly person; a fool.

As adjectives the difference between foolish and airheaded

is that foolish is lacking good sense or judgement; unwise while airheaded is silly, foolish.

As adjectives the difference between unintelligent and airheaded

is that unintelligent is not intelligent while airheaded is silly, foolish.

Airhead is a related term of airheaded.

As a noun airhead

is (pejorative) a silly, foolish or unintelligent person or airhead can be a landing area for aircraft for supplying an operation, military or other, usually temporary.

As an adjective airheaded is

silly, foolish.

As an adjective infectious

is (pathology|of an illness) transmitted from one person to another, usually through the air breathed.

As a noun amoebiasis is

(medicine) an infectious disease caused by the parasitic protozoan entamoeba histolytica ; amoebic dysentery.

As nouns the difference between disease and amoebiasis

is that disease is (pathology) an abnormal condition of the body or mind that causes discomfort or dysfunction; distinct from injury insofar as the latter is usually instantaneously acquired while amoebiasis is (medicine) an infectious disease caused by the parasitic protozoan entamoeba histolytica ; amoebic dysentery.

As a verb disease

is (obsolete) to cause unease; to annoy, irritate.

As nouns the difference between hay and hayfork

is that hay is (uncountable) grass cut and dried for use as animal fodder or hay can be the name of the letter for the h sound in pitman shorthand while hayfork is a tool used for moving hay; a pitchfork.

As a verb hay

is to cut grasses or herb plants for use as animal fodder.

As nouns the difference between syphilis and neurosyphilis

is that syphilis is a disease spread via sexual activity, caused by the bacterium Treponema pallidum while neurosyphilis is a syphilis infection affecting the nervous system.

As nouns the difference between ovary and ovariotomy

is that ovary is a female reproductive organ, often paired, that produces ova and in mammals secretes the hormones estrogen and progesterone while ovariotomy is a surgical removal of an ovary.

Ovariotomy is a synonym of oophorectomy.

As nouns the difference between oophorectomy and ovariotomy

is that oophorectomy is surgical removal of one or both ovaries while ovariotomy is a surgical removal of an ovary.