As a noun lichen

is any of many symbiotic organisms, being associations of fungi and algae; often found as white or yellow patches on old walls, etc.

In mathematics terms the difference between logarithm and trigonometry

is that logarithm is for a number $x$, the power to which a given base number must be raised in order to obtain $x$. Written $\backslash log\_b\; x$. For example, $\backslash log\_\{10\}\; 1000\; =\; 3$ because $10^3\; =\; 1000$ and $\backslash log\_2\; 16\; =\; 4$ because $2^4\; =\; 16$ while trigonometry is the branch of mathematics that deals with the relationships between the sides and the angles of triangles and the calculations based on them, particularly the trigonometric functions.

As nouns the difference between cryptic and encryption

is that cryptic is a cryptic crossword while encryption is the process of obscuring information to make it unreadable without special knowledge, key files, and/or passwords. May also apply to electronic signal, hard drive, message, document...

As an adjective cryptic

is having hidden meaning.

As a noun encryption is

(cryptography) the process of obscuring information to make it unreadable without special knowledge, key files, and/or passwords may also apply to electronic signal, hard drive, message, document.

As nouns the difference between oil and ghee

is that oil is liquid fat while ghee is a type of clarified butter used in South Asian cooking; usli ghee.

As a verb oil

is to lubricate with oil.

As nouns the difference between ceiling and roofs

is that ceiling is the surface that bounds the upper limit of a room while roofs is .

As verbs the difference between ceiling and roofs

is that ceiling is while roofs is (roof) (to install a roof).

As a proper noun prudence

is , one of the puritan virtue names.

As a noun drusen is

.

As nouns the difference between truth and truths

is that truth is the state or quality of being true to someone or something while truths is plural of lang=en.

As a verb truth

is to assert as true; to declare, to speak truthfully.

As an interjection hah

is huh?.

As a proper noun straw is

.

As a noun beanie is

a cap that fits the head closely, usually knitted from wool.