A black board is any board that is black, and equal prosodic stress can be found on both elements (or, according to psycholinguist Steven Pinker, the second one is accented more heavily.) A blackboard, the compound, may have started out as any other black board, but now is a thing that is constructed in a particular way, of a particular material and serves a particular purpose; the word is clearly accented on the first syllable.
Sound patterns, such as stresses placed on particular syllables, may indicate whether the word group is a compound or whether it is an adjective-+-noun phrase. A compound usually has a falling intonation: "bláckboard", the "Whíte House", as opposed to the phrases "bláck bóárd". (Note that this rule does not apply in all contexts. For example, the stress pattern "whíte house" would be expected for the compound, which happens to be a proper name, but it is also found in the emphatic negation "No, not the black house; the white house!"
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