As a noun heterogamete

is either of a pair of conjugating gametes that differ in structure or behaviour, such as the spermatozoon and the ovum.

As an adjective heterogametic is

(biology) that produces heterogametes.

In geology terms the difference between rock and poikilotopic

is that rock is any natural material with a distinctive composition of minerals while poikilotopic is describing a crystalline sedimentary rock having multisized crystals the larger of which enclose small ones, often of a different mineral.

As a noun rock

is the naturally occurring aggregate of solid mineral matter that constitutes a significant part of the earth's crust.

As a verb rock

is to move gently back and forth.

As a proper noun Rock

is {{surname|topographic|from=Middle English}} for someone living near a rock or an oak ( {{term|atter|lang=enm}} + {{term|oke|lang=enm}} ).

As an adjective poikilotopic is

describing a crystalline sedimentary rock having multisized crystals the larger of which enclose small ones, often of a different mineral.

As adjectives the difference between multisized and poikilotopic

is that multisized is of more than one size while poikilotopic is (geology) describing a crystalline sedimentary rock having multisized crystals the larger of which enclose small ones, often of a different mineral.

As a proper noun crystal

is .

As an adjective poikilotopic is

(geology) describing a crystalline sedimentary rock having multisized crystals the larger of which enclose small ones, often of a different mineral.

As a noun mineral

is mineral.

As an adjective poikilotopic is

(geology) describing a crystalline sedimentary rock having multisized crystals the larger of which enclose small ones, often of a different mineral.

Poikilocrystallic is a synonym of poikilotopic.

As an adjective poikilotopic is

(geology) describing a crystalline sedimentary rock having multisized crystals the larger of which enclose small ones, often of a different mineral.

As nouns the difference between underneath and undersurface

is that underneath is the part under or lower while undersurface is the underneath surface; the bottom, or underside.

As an adverb underneath

is below; in a place beneath.

As a preposition underneath

is under, below, beneath.

As an adjective underneath

is under, lower.

As nouns the difference between surface and undersurface

is that surface is the overside or up-side of a flat object such as a table, or of a liquid while undersurface is the underneath surface; the bottom, or underside.

As a verb surface

is to provide something with a surface.

As nouns the difference between bottom and undersurface

is that bottom is the lowest part from the uppermost part, in either of these senses: while undersurface is the underneath surface; the bottom, or underside.

As a verb bottom

is to fall to the lowest point.

As an adjective bottom

is the lowest or last place or position.

As nouns the difference between underside and undersurface

is that underside is the side that is below or underneath, the bottom while undersurface is the underneath surface; the bottom, or underside.