Word Unit: focus-, foci- (Latin: hearth, fireplace; fire, flame; central point, center)

Cross references of word groups that are related, directly, indirectly, or partly to: "fire, burn, glow, or ashes": ars-, ard-; -bust; cand-, cend-; caust-, caut-; crema-; ciner-; ether-; flagr-; flam-; fulg-; gehenna-; ign-; phleg-; phlog-; pyreto-, -pyrexia; pyr-; spod- (ashes; waste); volcan-.

Word Unit: Focusing on Words Newsletter #1 (the first newsletter of a series that was formerly presented as separate publications)
Word Unit: Focusing on Words Newsletter #2 (a connection of this and fourteen other Focusing on Words Newsletters are available for your learning opportunities by clicking on the link under the banner)
Word Unit: folio-, foli-, folii- (Latin: leaf, leaves; a plant's device for intercepting light, obtaining and storing water and nutrients, exchanging gases, and providing a process for photosynthesis)
Word Unit: foll-, folli- (Latin: bag; bellows; windbag; moneybag)
Word Unit: font-, fount- (Latin: fountain, spring)
Word Unit: for-, fora- + (Latin: bore, pierce, make holes; hole, holes; opening, openings,)
Word Unit: forbi-, forb- (Greek: phorbe, fodder, from pherbein, to graze; by extension: fodder, food; any herb other than grass, a broadleaf herb; a weed)
Word Unit: fore- (Old English: a prefix meaning before in place, rank, or time; in advance)
Word Unit: foren-, fore- (Latin: forensis of a forum, place of assembly; public, public speaking; foras, foranus, outside, residing outside, out of doors)
Word Unit: form-, -form, forma-, format- (Latin: shape, structure, figure, outer appearance, composition, to compose; visual appearance; spacial arrangement; to develop or to acquire; to produce)

Inter-related cross references, directly or indirectly, involving word units dealing with "form, shape, appearance": eido-; figur-; icono-; ideo-; imag-; morpho-; -oid; typo-.

Word Unit: formic-, form-, -formic (Latin: ant, ants)

Another word unit that is related directly to "ants": myrmeco-.

Word Unit: formid- (Latin: formido, "terror"; causing fear, terrible; to dread, to fear)
Word Unit: fornic-, fornix- (Latin: arch; vault)
Word Unit: fort-, forc- (Latin: brave; power, strength, strong)
Word Unit: fortu-, fortun- (Latin: chance, fate, luck)

A cross reference of other word family units that are related directly, or indirectly, to: "chance, luck, fate": aleato-; auspic-; cad-; -mancy; serendipity; sorc-; temer-; tycho-.

Word Unit: foss-, fossili-, fossil-, fossor- + (Latin: to dig, digging; dug out, dug up from beneath the surface; ditch, trench)
Word Unit: fove-, fovei- + (Latin: pit)
Word Unit: Fracking, Hydro Fracking, Hydraulic Fracturing Content Entries (Hydraulic fracturing, or fracking, is the practice of extracting natural gas from underground shale deposits by injecting high-pressure streams of water, sand, and chemicals)
Word Unit: frag-, frang-, fract-, fring- (Latin: break, breaking; broken; cracked)

Related break, broken-word units: clast-; rupt-.