As nouns the difference between sheath and theca

is that sheath is a scabbard; a holster for a sword while theca is (biology) any external case or sheath.

As a verb sheath

is to put an object (especially a weapon, in particular, a sword) into its sheath.

As nouns the difference between pollen and theca

is that pollen is while theca is (biology) any external case or sheath.

In botany|lang=en terms the difference between anther and theca

is that anther is (botany) the pollen-bearing part of the stamen of a flower while theca is (botany) the pollen producing organ usually found in pairs and forming an anther.

As nouns the difference between anther and theca

is that anther is (botany) the pollen-bearing part of the stamen of a flower while theca is (biology) any external case or sheath.

As nouns the difference between plankton and theca

is that plankton is plankton while theca is (biology) any external case or sheath.

Hypothecal is a derived term of hypotheca.

In microbiology|planktology|lang=en terms the difference between hypothecal and hypotheca

is that hypothecal is (microbiology|planktology) of or pertaining to the hypotheca, the lower half of the shell of certain types of plankton while hypotheca is (microbiology|planktology) the lower or posterior half of the theca of a thecate protist such as a diatom or dinoflagellate.

As an adjective hypothecal

is (microbiology|planktology) of or pertaining to the hypotheca, the lower half of the shell of certain types of plankton.

As a noun hypotheca is

(microbiology|planktology) the lower or posterior half of the theca of a thecate protist such as a diatom or dinoflagellate.

Hypotheca is a descendant of hypothec.

As nouns the difference between hypothec and hypotheca

is that hypothec is in Scotland, a landlord's right over the stocking (cattle, implements, etc.), and crops of his tenant, as security for payment of rent while hypotheca is the lower or posterior half of the theca of a thecate protist such as a diatom or dinoflagellate.

As a noun plankton

is plankton.

As an adjective hypothecal is

(microbiology|planktology) of or pertaining to the hypotheca, the lower half of the shell of certain types of plankton.

Epithecal is an antonym of hypothecal.

In microbiology|planktology|lang=en terms the difference between epithecal and hypothecal

is that epithecal is (microbiology|planktology) of or pertaining to the epitheca, the upper half of the shell of certain types of plankton while hypothecal is (microbiology|planktology) of or pertaining to the hypotheca, the lower half of the shell of certain types of plankton.

As adjectives the difference between epithecal and hypothecal

is that epithecal is (microbiology|planktology) of or pertaining to the epitheca, the upper half of the shell of certain types of plankton while hypothecal is (microbiology|planktology) of or pertaining to the hypotheca, the lower half of the shell of certain types of plankton.

As nouns the difference between hypothecation and hypothecary

is that hypothecation is the use of property, or an existing mortgage, as security for a loan, etc or hypothecation can be (british) a tax levied for a specific expenditure while hypothecary is (legal) the holder of a hypothec, or pledge.

As an adjective hypothecary is

of, pertaining to, or arising from hypothecation, the pledging of property or mortgage as surety for a loan.

In legal|lang=en terms the difference between hypothec and hypothecary

is that hypothec is (legal) in scotland, a landlord's right over the stocking (cattle, implements, etc), and crops of his tenant, as security for payment of rent while hypothecary is (legal) the holder of a hypothec, or pledge.

As nouns the difference between hypothec and hypothecary

is that hypothec is (legal) in scotland, a landlord's right over the stocking (cattle, implements, etc), and crops of his tenant, as security for payment of rent while hypothecary is (legal) the holder of a hypothec, or pledge.

As an adjective hypothecary is

of, pertaining to, or arising from hypothecation, the pledging of property or mortgage as surety for a loan.