pernicious

As a letter s

is the letter s with a.

As an adjective pernicious is

causing much harm in a subtle way.

Pernicious is a related term of tragic.

As adjectives the difference between pernicious and tragic

is that pernicious is causing much harm in a subtle way while tragic is causing great sadness or suffering.

As a noun tragic is

(obsolete) a writer of tragedy.

As adjectives the difference between relentless and pernicious

is that relentless is unrelenting or unyielding in severity while pernicious is causing much harm in a subtle way.

As adjectives the difference between pernicious and ephemeral

is that pernicious is causing much harm in a subtle way while ephemeral is lasting for a short period of time.

As a noun ephemeral is

something which lasts for a short period of time.

As a noun bane

is dwelling, abode, residence, half dilapidated house.

As an adjective pernicious is

causing much harm in a subtle way.

As adjectives the difference between discernible and pernicious

is that discernible is possible to discern; detectable or derivable by use of the senses or the intellect while pernicious is causing much harm in a subtle way.

As adjectives the difference between villainous and pernicious

is that villainous is of, relating to, or appropriate to a villain while pernicious is causing much harm in a subtle way.

As adjectives the difference between pernicious and undefined

is that pernicious is causing much harm in a subtle way while undefined is lacking a definition or value.

As adjectives the difference between pernicious and harrowing

is that pernicious is causing much harm in a subtle way while harrowing is causing pain or distress.

As a verb harrowing is

.

As a noun harrowing is

the process of breaking up earth with a harrow.

As adjectives the difference between pernicious and prevalent

is that pernicious is causing much harm in a subtle way while prevalent is prevalent.

As a verb prevalent is

.