Silent <b>: In Greek bdellium. Word-final [mb] has simplified to [m]: lamb, dumb, climb, womb, plumb, jamb, bomb, thumb, limb, crumb.
Silent <c >: In Latin indict. In one pronunciation of arctic. In words with the Greek base cten “comb”: ctene, ctenoid, ctenidium, ctenizid, ctenoid .
Silent <d >: In Wednesday. Between <n> and a consonant: hands, pounds, stands, landscape, grandfather, grandmother, handkerchief.
Silent <f >: I’m not aware of any words with silent <f>.
Silent <g>: You could argue that in the combination <gh> the <g> (and the <h>) are silent in words like fight, bough, slough, sought and the like. For more on <gh> see the answer to the earlier question “What is the <gh> doing in words like fright, weight, and high?” You could also argue that the <g> is silent in the combination <gn> in words like reign, sign, compaign, foreign, champagne, and also in gnat, gnash, gnaw, gnostic, gnome. I prefer to treat <gh> and <gn> as consonant digraphs, but as I say, you could argue that in them the <g> is silent