As nouns the difference between virus and scareware

is that virus is venom, as produced by a poisonous animal etc while scareware is software that attempts to scare the user into compliance, as by displaying false warnings of virus infection.

As nouns the difference between annoy and annoyware

is that annoy is a feeling of discomfort or vexation caused by what one dislikes while annoyware is (computing|informal) software that annoys the user, as by displaying constant advertisements or reminders to register.

As a verb annoy

is to disturb or irritate, especially by continued or repeated acts; to bother with unpleasant deeds.

As nouns the difference between advertisement and annoyware

is that advertisement is a commercial solicitation designed to sell some commodity, service or similar while annoyware is software that annoys the user, as by displaying constant advertisements or reminders to register.

As nouns the difference between reminder and annoyware

is that reminder is someone or something that reminds while annoyware is software that annoys the user, as by displaying constant advertisements or reminders to register.

As nouns the difference between freeware and payware

is that freeware is complete and functional software that does not require payment or other compensation (such as nags or advertising) for its use. Freeware may be a proprietary license with no access to the source code while payware is software for which a payment is required, as opposed to freeware.

Cheeseware is a synonym of crudware.

As nouns the difference between cheeseware and crudware

is that cheeseware is (computing|slang|pejorative) exceptionally low-quality software while crudware is (computing|informal) crapware.

Coasterware is a synonym of crudware.

As nouns the difference between coasterware and crudware

is that coasterware is (computing|slang|derogatory) exceptionally low-quality software while crudware is (computing|informal) crapware.

Crapware is a synonym of crudware.

As nouns the difference between crapware and crudware

is that crapware is unwanted software that comes pre-installed with personal computers while crudware is (computing|informal) crapware.

Shitware is a synonym of crudware.

As nouns the difference between shitware and crudware

is that shitware is (computing|derogatory|vulgar) software of exceptionally poor quality while crudware is (computing|informal) crapware.

As nouns the difference between registration and guiltware

is that registration is (uncountable) the act of signing up or registering for something while guiltware is (computing|informal) software that attempts to convince the user to fulfil some obligation (such as registration or donation to a charity) by eliciting feelings of guilt.