Lymphangiectasis is a synonym of lymphangiectasia.

As a noun lymphangiectasia is

(medicine) dilation of the lymphatic vessels.

In medicine|lang=en terms the difference between benign and lymphangioma

is that benign is (medicine) not posing any serious threat to health; not particularly aggressive or recurrent while lymphangioma is (medicine) a benign tumour of the lymph vessel.

As an adjective benign

is kind; gentle; mild.

As a noun lymphangioma is

(medicine) a benign tumour of the lymph vessel.

As nouns the difference between tumour and lymphangioma

is that tumour is (oncology|pathology) an abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia while lymphangioma is (medicine) a benign tumour of the lymph vessel.

As nouns the difference between lymph and lymphangioma

is that lymph is (obsolete|poetical) pure water while lymphangioma is (medicine) a benign tumour of the lymph vessel.

As nouns the difference between vessel and lymphangioma

is that vessel is (nautical) any craft designed for transportation on water, such as a ship or boat while lymphangioma is (medicine) a benign tumour of the lymph vessel.

As a verb vessel

is (obsolete|transitive) to put into a vessel.

As nouns the difference between disease and lymphangiopathy

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 lymphangiopathy is (medicine) any of several diseases of the lymph vessels.

As a verb disease

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

As nouns the difference between lymph and lymphangiopathy

is that lymph is (obsolete|poetical) pure water while lymphangiopathy is (medicine) any of several diseases of the lymph vessels.

As nouns the difference between vessel and lymphangiopathy

is that vessel is any craft designed for transportation on water, such as a ship or boat while lymphangiopathy is any of several diseases of the lymph vessels.

As a verb vessel

is to put into a vessel.

As nouns the difference between vertebra and spondylolisthesis

is that vertebra is any of the small bones which make up the backbone while spondylolisthesis is a forward displacement of a vertebra over a lower vertebra, due to a congenital defect or injury.

As an adjective congenital

is congenital: originating before birth and continuing or progressing thereafter.

As a noun spondylolisthesis is

(medicine) a forward displacement of a vertebra over a lower vertebra, due to a congenital defect or injury.