As a proper noun summer

is of modern usage, for a girl born in summer.

As an adjective unsummery is

not summery; unlike summer conditions.

Wintry is a see also of unsummery.

As adjectives the difference between wintry and unsummery

is that wintry is suggestive or characteristic of winter; cold, stormy while unsummery is not summery; unlike summer conditions.

Autumnal is a see also of unsummery.

As adjectives the difference between autumnal and unsummery

is that autumnal is of or relating to autumn while unsummery is not summery; unlike summer conditions.

As nouns the difference between performance and underperformer

is that performance is the act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action while underperformer is one who or that which underperforms, having performance that is below average or below expectations; often specifically a company or stock.

Underachiever is a synonym of underperformer.

As nouns the difference between underachiever and underperformer

is that underachiever is one who underachieves by performing less well than expected while underperformer is one who or that which underperforms, having performance that is below average or below expectations; often specifically a company or stock.

Underperformer is a related term of underperformance.

As nouns the difference between underperformance and underperformer

is that underperformance is the state or quality of underperforming while underperformer is one who or that which underperforms, having performance that is below average or below expectations; often specifically a company or stock.

As nouns the difference between connoisseur and videophile

is that connoisseur is a specialist of a given field whose opinion is valued; especially in one of the fine arts, or in a matter of taste while videophile is a connoisseur of video, particularly one who values high-definition and otherwise high-quality video.

Videophile is a related term of bibliophile.

As nouns the difference between bibliophile and videophile

is that bibliophile is one who loves books while videophile is a connoisseur of video, particularly one who values high-definition and otherwise high-quality video.

As nouns the difference between tendon and tenolysis

is that tendon is tendon while tenolysis is (surgery) a surgical procedure in which a tendon is separated from its sheath.

As a verb palatized

is past tense of palatize.

As a noun palatovelar is

a velar sound articulated further in the mouth at the area of soft palate; a palatized velar.