As a noun foodgrain is

cereal (grain grown as human food).

As nouns the difference between prospect and prospectus

is that prospect is the region which the eye overlooks at one time; view; scene; outlook while prospectus is a document, distributed to prospective members, investors, buyers, or participants, which describes an institution (such as a university), a publication, or a business and what it has to offer.

As a verb prospect

is to search, as for gold.

As a verb conserve is

.

In transitive terms the difference between valve and vault

is that valve is to control (flow) by means of a valve while vault is to build as, or cover with a vault.

As verbs the difference between revise and rehearse

is that revise is to look at again, to reflect on while rehearse is to repeat, as what has been already said; to tell over again; to recite.

As a noun revise

is a review or a revision.

As verbs the difference between permeabilizing and permeabilising

is that permeabilizing is while permeabilising is .

As verbs the difference between holloing and helloing

is that holloing is while helloing is .

As an adjective undergrown

is insufficiently grown; not having grown to a normal or suitable size.

As a noun undergown is

a gown worn under another, or under some other article of dress.

As verbs the difference between wakest and wavest

is that wakest is while wavest is (archaic) (wave).

As nouns the difference between fuddlers and cuddlers

is that fuddlers is plural of lang=en while cuddlers is plural of cuddler.